How to calculate the expected due date. Methods for determining the date of birth: how gynecologists calculate the date by the first number of the last menstruation, is it possible to find out by ultrasound or ovulation calendar

Determining the gestational age and the estimated date of birth is very important for both the woman and the doctor leading her. Many laboratory and instrumental studies are prescribed precisely at the time when it is easiest to identify the pathology in time. Comparison of fetal parameters with the average statistical indicators of each period of pregnancy helps to identify and correct underdevelopment. Clarity in determining the date of birth of a child allows you to carefully prepare for this event and open a sick leave in time so that the woman has time to gain strength before childbirth.

There are several methods to help calculate the required indicators. An obstetrician-gynecologist uses them in combination, since almost every method has an allowable error associated with subjective reasons: the individual characteristics of a woman, elementary forgetfulness - it is difficult to remember the date of the last menstruation. The term of the expected birth can be determined quite approximately, since a full-term pregnancy lasts from 38 to 42 weeks, and this is normal from the point of view of physiology.

Negele formula

The method of calculating the due date using this formula is great for women with a regular standard cycle lasting 28 days. Negele's formula is simple - to determine the desired date, you need to subtract 3 months from the first day of the last menstruation, and then add 7 days to the resulting figure. If the menstrual cycle was constant, but lasted more or less than the standard one, the difference between your own and the standard cycle should be added to the date obtained, or the same number of days should be subtracted.

How to calculate due date based on ovulation date?

If a woman in the month preceding conception determined the onset of ovulation by basal temperature, this will help to accurately determine the gestational age. Conception occurs on the day of ovulation, when the egg ready for fertilization leaves the ovary. If sexual intercourse took place 1-2 days before ovulation, spermatozoa remain ready for fertilization all this time, that is, conception can occur a short time after sexual contact. If you add 38 weeks, or 266 days, to the date of ovulation, you can find out the estimated date of birth of the child.

If a woman does not know when she ovulated, but has a stable 28-day menstrual cycle, it is assumed that conception occurred in the middle of the cycle, that is, on day 14. With an irregular cycle, this method has an error.

We determine the date by the movement of the child

The date when a woman first felt the baby move is very important for correcting a comprehensive calculation of the term of the expected birth. Although the fetus begins to move as early as the twelfth week, for the first time most women feel these gentle movements in the middle of the gestational period, that is, in the twentieth week. However, this rule does not apply to everyone - during the second and subsequent pregnancies, a woman may feel the first movements 2 weeks earlier.

A primiparous woman of a fragile physique also has such an opportunity, while a pregnant woman with a solid build feels movements later. These sensations can be called subjective, because they depend on the woman's sensitivity to what is happening in her body. The thickness of the myometrium also affects the severity of the movements of the child.

All these nuances mean that the above method of determining the date of birth cannot be considered the main one, it is used only in combination with other methods.

How do obstetricians-gynecologists calculate the gestational age?

When calculating the gestational age, the doctor usually relies on the start date of the last menstruation, however, the main calculations are carried out taking into account a complex of various criteria.

According to the size of the uterus

In the early stages of pregnancy, when individual differences in fetal size are not yet apparent, it is possible to determine the date of delivery using this technique. For a period of 4 weeks, the size of the uterus is compared with a chicken egg, for a period of 8 weeks - with a goose.

From the twelfth week, this method is already difficult to apply, since in the future the parameters of the uterus and fetus differ in different women with the same period.

According to ultrasound

The method of determining the date of birth according to ultrasound scanning is valid at the beginning of the gestational period, more precisely, until the third month. After twelve weeks, it is impossible to accurately determine the date of birth based on ultrasound data due to individual differences in fetal parameters in women of different constitutions.

According to the height of the fundus of the uterus

This method has been used by the obstetrician-gynecologist since the beginning of the second trimester. The longer the fetus develops, the higher the bottom of the organ becomes, which rises beyond the small pelvis.

The height of the fundus of the uterus is determined when the woman is lying on her back. The doctor carefully palpates the abdomen and measures the distance from the pubic symphysis to the fundus of the uterus. This indicator increases evenly throughout the gestational period, and immediately before childbirth, the uterus descends.

When using this technique, an error of 2-3 cm is laid. It can be caused by polyhydramnios, pregnancy with twins or triplets, the age of the woman, and the size of the fetus. To clarify the indicators, the waist circumference of the pregnant woman and the parameters of the fetus are taken into account.

Calculation of the height of the fundus of the uterus by week:

8-9 weeks - height 8-9 cm, the uterus is still located within the small pelvis;

10-13 weeks - height 10-11 cm, the uterus increases, the placenta develops intensively, the fetal cardiovascular system begins to work;

16-17 weeks - height 14-18 cm, the uterus is located between the navel and the pubic joint, the fetus looks like a little man, all of whose organs are already laid;

18-19 weeks - height 18-19 cm, the unborn child develops arms and legs with fingers, the cerebellum, the immune system, the placenta fully assumes the responsibility for ensuring the functioning of the fetus;

20 weeks - the height of the uterus in centimeters corresponds to the gestational age in weeks;

21 weeks - height 21 cm, from now on the height of the uterus will increase by 1 cm weekly, now it is 2 fingers below the navel.

22-24 weeks - height 22-24 cm, the bottom of the uterus at the level of the navel, easily determined by palpation, the body weight of the fetus is 0.6-0.7 kg;

25-27 weeks - height 25-28 cm;

28-30 weeks - height 28-31 cm;

32 weeks - height 32 cm, the upper edge of the uterus is located between the xiphoid process of the sternum and the navel;

36 weeks - height 36-37 cm, the uterus is palpable at the line of connection of the costal arches;

39 weeks - height 36-38 cm, the uterus begins to descend, the weight of the fetus exceeds 2 kg;

40 weeks - the height of the uterus decreases to 32 cm, it is again between the navel and the ribs, the child is ready for delivery.

Head size and fetus length

To calculate the gestational age, the following methods are used:

Jordanian method. The term is calculated according to the formula X=L+C, where X is the term in weeks, L is the length of the body of the fetus (cm), C is the diameter of its head (cm).

Skulsky method. Here the formula is: X = (L x 2) - 5/5, where L is the length of the fetal body (cm), the number 5 in the numerator of the fraction is the thickness of the myometrium, the number 5 in its denominator is a special coefficient.

Any calculations are only an approximate guideline. According to medical statistics, only 10-17% of babies are born on time, the rest are born earlier or later than the expected date. This circumstance is influenced by many factors: heredity, pregnancy pathologies, stressful situations and other reasons.

When does a woman begin to be interested in the date of birth?

Then, when it comes time to prepare a dowry for the baby or when it comes time to go on maternity leave, to transfer all cases to colleagues for a while, and maybe much earlier, when only the expectant mother wants to influence the fate of her baby by planning his birth under a certain zodiac sign ?

One way or another, everyone is interested in determining the possible date of birth. In anticipation of changes in the composition of the family, you need to plan the time of holidays, the family budget, you may have to turn to future grandmothers for help.

From a medical point of view, the date of delivery is important when planning a caesarean section or for those women who will be calmer and more comfortable waiting for the moment of delivery in a hospital.

The abbreviation PDD means "estimated (planned) date of birth." It is worth paying attention to the fact that the date is precisely “estimated”.

No one can say for sure when your baby will decide to be born. But there are calculation formulas based on statistical data and the characteristics of female physiological cycles.

Many factors can affect the due date. Among them are the diseases of a woman, and the influence of ecology, and possible variations in the location of the placenta.

Important is the emotional state of the expectant mother and her age. But in the case of a normal pregnancy in a healthy young woman, the discrepancy between the actual date of birth and the calculated due date will be small (3-5 days).

Determination of the EDD by the date of the last menstruation

The Naegele formula, by which this calculation is made, is based on the fact that a normal pregnancy lasts 10 lunar months (280 days). Therefore, if a woman kept a monthly calendar and knew exactly their date, you need to count back 3 months, and then add another 7 days to the result:

EDD \u003d Date of menstruation - 3 months + 7 days

that is, if menstruation was on February 10, then counting back 3 months we get November 10, and adding 7 days we find out the PDR - November 17.

Calculation of EDD by ovulation

If you were planning a pregnancy and the date of conception, then you probably followed. allows you to determine. Adding 38 weeks (268 days) to this day, we get the possible date of birth.

ODD = Date of ovulation + 38 weeks.

How to calculate the estimated due date from the date of conception

If a woman knows exactly the date of sexual intercourse, which resulted in conception, another way to determine the date of birth can be offered. Physiologically, it is based on the same cycle as the basal temperature calculation, but does not require any preliminary measurements and charts.

EDD = date of conception + 266 days

That is, if sexual intercourse occurred on March 10, the expected date of birth will be November 22. The error of this formula is 3-5 days, it is associated with the period of life of a spermatozoon in a woman's body.

Determination of PDR during a medical examination is the most accurate method

If a woman registers for pregnancy in the early stages, then the condition and size of the uterus, the doctor will determine the duration of pregnancy and the approximate date of its completion (based on the "average" period of 40 weeks).

For a short period, the uterus is not yet palpable through the outer abdominal wall and a manual obstetric examination can tell about the period. But its characteristics are very subjective and depend on the qualifications of the doctor.

At 4 weeks, the uterus is the size of a chicken egg, by 8 weeks it will be larger - like a goose egg, and by 12 weeks it will reach the edge of the pubic bone.

An experienced obstetrician-gynecologist can determine the gestational age from these data.

Note that this technique works most accurately at the beginning of the first trimester. If a woman is not in a hurry for the first medical appointment, then there may be an error related to whether a large fetus is expected to appear, whether there is polyhydramnios, etc.

Planning the date of birth based on the results of ultrasound

During an ultrasound examination, it is possible to accurately determine the size of the fetus and its maturity. This will allow you to guess the date of birth.

Moreover, if you go for an examination in the first trimester and the gestational age is determined by the size of the fetal egg, then when you repeat, the doctor can tell you other data. This is not due to a mistake, just the intrauterine development of the baby is uneven.

The closer the due date, the more accurately you can determine the readiness of the child for birth.

For example, to plan hospitalization, preparation for a caesarean section.

Determination of the PDR by the date of the first movement

This method is less accurate than the previous ones, but is also physiologically justified.

All other formulas: calculation by the date of menstruation, ovulation or movement, are based on a standard 28-day cycle.

If a woman's menstrual cycle is less or more than 28 days, her physiological and metabolic processes may not fit into the calculated time frame. Moreover, there is not always a direct relationship here (that is, a woman who has a cycle of 25 days should not subtract 250 days from the date of the last menstruation instead of 280.

In any case, the calculation is carried out according to the standard formula. Just keep in mind that in your case, the likelihood of a baby being born a little earlier than the expected date increases).

The method with the greatest error - calculating the EDD by the date of the first movement - is further complicated by the fact that not every woman can accurately determine the moment of the first movement. The movements of the child are often mistaken for peristalsis or gases.

In addition to the objective calculation error, the date of birth can be affected by:

• chronic diseases of a woman;
• bad habits;
• heredity;
• or multiple pregnancy;
• mother's age;
• a cold or bacterial infection already during pregnancy;
• repeated births;
• fetal pathology;
• stress.

As soon as she finds out about the pregnancy, the woman is already interested in the expected date of birth. After all, by this moment you need to prepare a dowry for a newborn, if necessary, provide yourself with assistants or pick up a nanny for older children, plan a family budget, taking into account replenishment of the family and a long vacation for the mother.

Someone is in a hurry by the time the baby is born to improve living conditions, make repairs or move closer to relatives. And all these issues need to be resolved by a specific date, the DA.

The methods for calculating the date of birth were very relevant, the calculation formulas were developed by obstetricians in different countries. With the advent of ultrasound, other methods with a large error began to be used less frequently. But they still arouse the interest of those who want to make a calculation without consulting a doctor, or at the stage of pregnancy planning.

The question of how to determine the date of birth often causes discussion and controversy among pregnant women. The difference between your own calculations, the terms that are set during an ultrasound examination and those that the doctor writes on your card is completely confusing. Specifically, in order to at least a little, but still make life easier for pregnant women, we have developed a program that independently calculates the estimated date of birth. Now you don’t have to visit a doctor or bother yourself with mathematical calculations, just to calculate the date of birth of your baby, you just need to enter the number in the right column of the calculator when your last menstruation began.

Negele's formula is a two-step puzzle.

The program that allows you to calculate the date of birth is based on the Negele formula, named after the German obstetrician who first proposed using this simple calculation method. It is known that pregnancy lasts an average of 40 weeks from the beginning of the last menstruation or 38 from the moment of conception. Negele simplified the calculations by reducing them to a few simple arithmetic operations - remember the date of the onset of menstruation that preceded pregnancy and subtract 3 months. You need to add 7 days to the resulting figure - this number is the same date of birth.

The question often arises - why should the calculation of the date of birth be based on the date of the last menstruation? This tradition, generally accepted in obstetrics, is justified, because not all women know exactly the day of ovulation, while most keep a calendar of menstruation. Bewilderment is also natural - after all, in the first, so-called "weeks of pregnancy", conception has not even occurred yet. Yes, this is true, and this period refers to the gestational age conditionally, for the convenience of obstetrician-gynecologists, according to the standards. The fetus begins to exist when it is already behind about 14 days of pregnancy. If the date of fertilization is reliably known, you can calculate the date of birth yourself by adding 266 days or entrust it to our calculator.

Deviation from the estimated date - is this the norm?

It is worth noting that the estimated date of birth for you is nothing more than a guideline. In fact, about 17% of women give birth on day X, the remaining 83% a little earlier or later. Predicting the onset of labor is beyond the power of any specialist. Moreover, normal, urgent births, that is, births that occurred at physiological times, are those that happened from 38 to 42 weeks of pregnancy. Often there is an unpredictable post-maturity or prematurity of pregnancy. Premature labor can be provoked by deviations in the development of the fetus, pathological processes in the mother's body, stressful situations, hereditary factors, and many other reasons. Therefore, it is very important to understand that the calculation of the date of birth is a very conditional concept, regardless of the method used.

However, there is some pattern, given which we can assume the development of the situation with a healthy pregnancy - the longer the monthly cycle, the longer the pregnancy lasts. Before you determine the date of birth, taking into account your individual characteristics, remember the duration of your menstrual cycle - from the first day of one period to the first day of others. If the cycle is longer than the standard 28 days, the pregnancy will probably last more than 40 weeks, and vice versa. Keep in mind that we are talking about the transfer of the estimated date of birth by no more than 5 days.

The calculator will help you calculate your due date from your period as accurately as possible, but you should remember that the data obtained from a medical examination is crucial, as it is more reliable. The reason for this approach is that menstruation is easily confused with bleeding that opened after conception and spontaneously stopped. Also, when examined in the third trimester or ultrasound of the uterus, the doctor can observe the degree of maturity of the placenta, the position of the fetal head in relation to the entrance to the small pelvis, the opening of the cervix, signs of full-term fetus and many other important data. By all these parameters, one can judge the readiness of the fetus and uterus for childbirth and the likelihood of their early onset. In addition, focusing on the size and proportions of the fetus during ultrasound, the doctor sets the age of the fetus in accordance with.

Pregnancy- a period of change in a woman's life. How many new things she has to learn about herself and her body, about children and even about medicine. How many new terms she will hear! PDR and the pregnancy calendar are one of them. In this article, we will look at what it is.

Everyone knows that pregnancy lasts 9 months. However, having become pregnant, the expectant mother discovers that the term is measured not in months, but in weeks, and there are 40 of them, that is, almost 10 months. Moreover, the child is considered full-term from 38 weeks. The pregnancy calendar is a list of changes that occur with the body of the expectant mother and with her baby for each week of gestation. The term itself is divided into three periods, called trimesters. Let's consider each of them.

First trimester of pregnancy

It lasts from the first to the thirteenth week pregnancy included. This is the most important (if one can “compete” in importance here) and dangerous period. The greatest number of miscarriages occurs during this period, so the expectant mother needs to carefully monitor her health.

In the first three months of pregnancy, the egg is fertilized, then it attaches to the uterus (implantation, i.e. the actual onset of pregnancy) and the formation of the fetus. Initially, the embryo does not look like a person at all: it is just a small ball.

By the end of the first month, the size of the embryo is only 4 mm. It's about the size of a grain of rice. And yet, his internal organs are already forming: the neural tube, the heart, the genital gonads. On the 21st day of pregnancy, with the help of ultrasound, you can hear the heartbeat of a little man: 110-130 beats per minute.

On the 4th-5th weeks there is an active development of the brain. The head takes up a third of the total size.

Between the 7th and 8th weeks, the embryo develops into a fetus. There is separation of the fingers and toes. And from the 8th week it is officially called the fetus.

At 8-9 weeks, all facial features are already distinguishable, the genitals, intestines are formed, fingers appear on the hands.

At 10-12 weeks, the baby begins to move, but the mother does not feel it yet, nails appear on the fingers, and the rudiments of teeth appear in the gums. The heart is fully formed, and the endocrine system begins to produce hormones.

In the first trimester of pregnancy, the expectant mother may experience toxicosis: nausea, sweating, increased salivation, itching of the skin, etc. This is a rather difficult period in the life of both the child and the mother. The mother-placenta-fetus relationship is formed. There is a real hormonal storm in a woman's body!

At about 11-13 weeks, the doctor prescribes the first screening test, which consists of a blood test and ultrasound. It is during this period that it is possible to determine the presence of such genetic diseases as Down syndrome, Edwards, Patau, de Lange, Smith-Opitz.

Second trimester of pregnancy

This is the period from the fourteenth to the twenty-seventh week bearing a child. This is the most fertile time of pregnancy: the first fears and anxieties are over, toxicosis has already ended, but at the same time, the tummy is not too big and does not constrain mom in activities. Enjoy!

During this period, there is an active growth and development of the child. If at the beginning of the second trimester the child was only 10 cm with a weight of 30 g, then by the end it is already as much as 1.2 kg with a height of 35 cm!

The child is actively moving. He explores himself: touches his face with his hands, sucks his fingers, plays with the umbilical cord. Most of the time it is upside down, but it can also turn over. From about 18-22 weeks, a woman begins to feel these movements. The primiparous mother feels them later, around the 20th week, and the "experienced" mother - a little earlier: at the 18th week.

A thin fluff appears above the upper lip, on the eyebrows and on the head. This is latungo. It is designed to keep the original lubricant on the baby's body.

During this period, the tummy begins to grow noticeably. Your old clothes become tight and it's time to replenish your wardrobe with "pregnant" clothes. Pay attention to special tights for pregnant women, trousers, dresses and tunics. In addition, your doctor may prescribe that you wear a support bandage.

At 16-18 weeks, you will need to undergo a second trimester screening. It includes an ultrasound and a blood test (the so-called "triple" test for the level of human chorionic gonadotropin, alpha-fetoprotein and estriol). This allows you to identify malformations and chromosomal abnormalities of the fetus.

Third trimester of pregnancy

This is the period from the 28th week of pregnancy until the birth itself. Finish line. The period of final formation of the child. At this time, there is a risk of premature birth and late toxicosis (gestosis). Pregnancy is considered mature from the 38th week. Those. if the birth has occurred since the first day of the 38th week, then the child is considered full-term.

This is the period of the final formation of the child: nails grow to the fingertips, permanent teeth are formed under the milk teeth. The child begins to hear and distinguish voices. Now he knows his mother's voice and prefers it to all others after birth.

The movements of the baby are more and more clear. He pushes and kicks, and now not only you can feel it, but also any person who puts his hand to your stomach. By the end of the gestation period, the child becomes so large that it is already difficult for him to perform somersaults and he remains in one position. Most children turn their heads to the lower abdomen. This is called head presentation. If the child lies down with his feet or buttocks, then this is a breech presentation.

In the third trimester, the body of the expectant mother begins to prepare for childbirth. The cervix becomes more elastic, colostrum can be released from the breast.

It becomes difficult to move because of the grown belly. For the same reason, heartburn may begin and hemorrhoids will be found.

During this period, it is better to prepare all the necessary things for the hospital and for the baby.

How to calculate the due date: weekly pregnancy calendar

Having examined in detail the stages of the formation and development of a child in the womb, we came to the concept of PDR, that is, the expected date of birth. From the name it is clear that this is the expected date of birth of the baby. There are several ways to determine it, which will be discussed below. However, it is worth noting that only 17% of children are born on the date of the due date. The remaining 83%, that is, the absolute majority, are born "around" the DA (if we do not talk about emergency unplanned or premature births).

Determination of the term by the date of conception

If the pregnancy was planned, then, usually, the exact date of the sexual intercourse that led to it is known. To this date, 280 days are added (i.e. 40 weeks) and thus the DA is determined. This method is the most accurate, but not one hundred percent (as, in fact, no other). Deviations can be within 1-3 days, since fertilization itself can occur not directly on the day of sexual intercourse, but within a few days after it.

Determination of the period by the date of menstruation

This is the most commonly used method in obstetrics for determining the PDR. It was proposed by the German obstetrician Negele. The calculations are as follows: three months are subtracted from the first day of the last menstruation and 7 days are added. That is, if the last menstruation began, for example, on June 1, subtract 3 months (March, April, May), add 7 days and get the EDD on March 8.

Determination of the term by the date of ovulation

Another way to calculate the estimated date of birth is to calculate by the date of ovulation. 280 days are added to this date and the DA is obtained. However, the complexity of this method lies in the fact that not all women follow their cycle and even more so do not know their ovulation schedule. If you are attentive to your health, then this method can help you find out the date of birth of your child.

Ultrasound calculation accuracy

The date of delivery is also determined at the first mandatory ultrasound, during the screening of the first trimester. It must be completed at 8-11 weeks. During this period, the doctor determines the compliance of the size of the child with the expected gestational age and determines the PDR. This method is the most accurate. However, no method provides an absolute guarantee. In addition, doctors prefer to combine several methods to determine the date of birth.

How to calculate the sex of the child: weekly pregnancy calendar

"Who are you waiting for: a boy or a girl?" - this is the most asked question of a pregnant woman. Disputes about the sex of the baby often begin even before conception and do not stop until the very birth. And since this is such an important question, we decided to look at several ways to find the answer to this question.

Determination by blood type

This method can be divided into several subspecies.

Determination by blood group. You need to know the blood type of mom and dad and see the result in the table. The reliability of this method is very doubtful, because in practice children of different sexes are quite often found in the same family.

According to the Rh factor. He matters too. If it is the same for both parents, then there will be a boy, and if it is different. That is possible options. This method is also unreliable. In addition, it can produce the opposite result with the previous one.

For the renewal of the blood. Its essence lies in the fact that the blood of a man and a woman is renewed at different rates: for women every 3 years, and for men every 4. Whose blood will be “younger” at the time of conception, the child will be born of this gender. To do this, the age of the mother is divided by 3, and the father, respectively, by 4. But it is also worth considering large blood loss: donation (both blood donation and transfusion), operations, abortions, injuries. Those. should be counted from the date of the last blood loss.

Let's look at an example. Let the expectant mother at the time of conception be 26 years old, and the father - 29. Divide 26 by 3, we get 8.7 and 29 by 4, we get 7.3. We analyze the numbers after the comma: 7 for mom and 3 for dad. It turns out that the father's blood was renewed quite recently, that is, the parents, most likely, will be waiting for the boy.

Determination of the sex of the unborn child using ultrasound

This is the most reliable of the publicly available methods. However, its veracity directly depends on the timing of the study and the experience of the doctor. Until the 8th week of pregnancy, the baby does not have a gender. The process of formation of the genitals ends by about 10-12 weeks.

But doctors recommend performing an ultrasound to determine the sex no earlier than the 15th week. However, most often everything is found out during the screening of the second trimester (22-25 weeks of pregnancy). On the monitor, the doctor should visualize the scrotum and penis, if the child is male, and the labia majora, if female. Sometimes the loops of the umbilical cord or the fingers of the fetal hand are mistaken for the penis, and in utero girls there is a swelling of the labia that passes over time, which are mistaken for the scrotum.

Definition by the appearance of a pregnant woman

One of the most controversial and even playful ways, which, nevertheless, sometimes gives a result. What is called, "not thanks to, but in spite of." It is popularly believed that if the stomach sticks out like a ball, then a boy is sitting there, and if it is flatter, neater, then a girl.

However, the shape of the abdomen is influenced by two factors: the size of the baby and its intrauterine position. Yes, indeed, boys are often larger than girls, but not so much that it affects the size of the abdomen. Well, the intrauterine position does not depend on gender at all and can change throughout pregnancy.

Sex determination by folk methods

Folk methods have been passed down from generation to generation since the days when there was no ultrasound. What our great-grandmothers and grandmothers did not think of! Now all this seems more like an anecdote than a real way to find out the gender of the child, but still let's talk about them. As they say, a moment of positive.

• Wedding ring method. You should hang the wedding ring on a thread above the hand or stomach of the expectant mother. If it starts spinning in a circle - wait for a girl, if from side to side - a boy. Instead of a ring, you can use a needle or nut.
• Divination with a key. You need to find a round key, with a round head and a long leg, and put it in front of the pregnant woman. If she took him by the head - to the girl, if by the leg - to the boy, if in the middle - to the twins.

A few more clues:

• If during pregnancy the future father is gaining weight on a par with his wife - to the boy, if the woman has recovered in the hip area - to the girl.
• If the expectant mother began to look worse (pimples or age spots appeared on her face, redness), it means that the girl, as it were, “takes away beauty”. If the pregnant woman looks great for all months, expect a boy.
• If there is a boy in the stomach, then it draws on sour, salty, meat and milk; if a girl, then she is drawn to sweet and fruity.
• Expectant mothers of boys have an increased appetite throughout pregnancy, and mothers of girls feel sick, especially in the first trimester.

Chinese pregnancy calendar: How to calculate the gender of the baby

It is a table, which, according to legend, was found in one of the burials in ancient China. Shows the relationship of the sex of the child with the age of the mother and the month of conception.

Japanese baby gender calendar

Japanese calendar based on the relationship of the sex of the child and the months of birth of the parents and the month of conception. In the first table, find the number at the intersection of the months of birth of the mother and father. Then, in the second table, find the column at the top of which is this figure. It indicates the months of conception, and opposite each month is the probability of the birth of a boy or girl, expressed by the number of crosses. The more crosses, the higher the likelihood of conceiving a child of one sex or another.

If you want to know how to calculate the due date, then it is here that you will find answers to all your questions about this. You can calculate the date of birth by the date of conception, as well as by the last menstruation. If you have access to the Internet, then you can calculate the moment of the birth of a child online for free.

If you do not really trust the online calculator, you can calculate the approximate date of birth yourself, guided by special formulas. We will also talk about them in this article. The exact date of birth is difficult to calculate, since the child himself decides when he will be born. So, let's talk about everything in order. How to calculate the date of birth so that it exactly coincides in the future with the birth of a child.

due date calculator

Determining the due date: What are the ways to determine the approximate due date?

So, you took a pregnancy test and it came out positive. Now we calculate the moment of birth of the child. The date of birth is considered differently. There are several ways. We will talk about all of them. Let's first list the possible options for calculating the approximate date of birth. Here they are:

1. you can determine the date of birth both online and without the Internet by the date of conception;
2. you can calculate the date of birth by the last menstrual period.

Both of these methods can be used together. They do not exclude each other. The most correct option for calculating and calculating the upcoming birth and gestational age in weeks, as well as the size of the fetus, is, of course, ultrasound diagnostics. With the help of it, gynecologists determine the most accurate moment of the birth of a child. He will also determine whether you yourself will be able to give birth or you will need to do a caesarean section if the size of the fetus is large or the baby lies incorrectly. He will also explain who assigns and pays a woman child care benefits during maternity leave (employer or FSS). But we will talk about those methods for determining the date of birth and gestational age, for which you do not need to leave the house and even get up from your favorite sofa. After all, you can find out everything using the Internet.

How to calculate childbirth by date of conception?

To calculate the expected moment of birth of a baby by the date of conception and determine the gestational age in weeks, you must have a regular menstrual cycle and know when ovulation occurred. After all, conception is possible only during ovulation. Well, we are not even talking about what else you need to remember the day on which there was intimacy with your loved one. It's obvious. If, suppose, most women have 28 days of menstruation, then ovulation, as a rule, occurs on the 14-15th day.

But it is worth noting that the conception of the fetus might not have occurred on the day of sexual intimacy. It has been noticed that spermatozoa are able to live even for 3 days, “walking” while inside a woman. Therefore, here the approximate moment of the birth of the fetus by the date of conception will be determined approximately, and not day by day. The error can be even one or two weeks. So, now you need to add 280 days to the day of conception (this is exactly how much the average pregnancy lasts for most women). So you calculate and determine the date of birth at conception and the gestational age in weeks. It's pretty simple if you have a regular menstrual cycle and a good memory.

If you don’t want to bother yourself and want to immediately determine the day of your birth by conception and the gestational age in weeks, then use a special calculator on our website for this. Here it will be enough just to enter the estimated day of ovulation in the table and click the "Calculate" button. The computer will calculate and give the gestational age in weeks and the date of birth. As a result, you will know when the baby will appear and will look forward to this day and will no longer look for the answer to the question “How to determine the date of birth by conception”. This is a kind of fascinating fortune-telling that gives a correct prediction.

How to calculate the exact date of birth by menstruation and find out what week of pregnancy you are?

To calculate and find out the most accurate date of birth by menstruation, that is, to find out when we give birth, you should also have a regular menstrual cycle. The formula for calculating the moment of birth of a child based on the last menstruation of a pregnant woman is used in their practice by all gynecologists. They will certainly ask the future mother who came to see them about the first day of the last menstruation. There are probably no such pregnant women who were not interested in the first day of the last menstruation by gynecologists.

So, we calculate the approximate birthday of your child and find out how to determine the date of birth by the last menstrual cycle (by its first day). In order to start calculating the preliminary day of childbirth, from the first day of the last menstruation, you must count three months ago, and then add seven days. So it turns out the approximate day of the birth of a child.

If you don’t want to count in your mind, you can calculate the moment of birth of the baby using an online calculator, which, after entering the data, will give you the due date and which week you are automatically. To do this, simply enter the first day of the last menstrual cycle in a special calculator window, as well as the average duration of menstruation and the duration of the luteal phase (for most women, it lasts two weeks, that is, 14 days). Next, click the "Calculate" button and wait for the results of the online test. Almost every woman used such a calculator. It is popular at the moment.

Now you know how to calculate the due date, the calculator will always help with this. And also, now it’s not a problem for you to find out the duration of your pregnancy in weeks and even days. We hope that you will make the calculation correctly and without much difficulty and with great pleasure and in the future make sure that the actual day of the birth of the child coincides with the one given by the calculator! In the future, the question “How to determine the date of birth online” will not arise for you. Read about how to determine the date of birth by ultrasound and fetal movements, as well as how to bring the date of birth closer and get pregnant using IVF in other articles on our website.