The extension of the gestational age and the date of birth affects a lot: the beginning of prenatal leave, the diagnosis of premature birth, the possibility of tracking the development of the fetus. Information about age, fruit size is important in the case of cesarean section (in order to avoid early operations); If the expectant mother has diabetes (since the fetus is larger than normal sizes, difficulties in childbirth may occur).
The generally established calculation formula is quite simple: 280 days are added to the date of the day after the last menstruation. It is equal to 10 obstetric or 9 calendar months (40 weeks). But such a calculation formula does not always give the correct result. Pregnancy is affected by the characteristics of the organisms of the mother and the developing child. 280 days is the average pregnancy period. In different cases, deviations from a generally accepted period are possible. It is considered a normal scatter of 2 weeks – from 38 to 42 weeks. Girls are usually born a little earlier.
Reasons affecting the accuracy of determining the deadline and date of birth
The date of birth can be more accurately determined if the day of ovulation and the date of conception are known. The main obstacle to determining the deadline is that at first, pregnancy does not manifest itself with any signs.
Pregnancy begins when female and male germ cells. The most suitable time for conception is the time of ovulation – this is when the ripened egg leaves the ovary. The egg becomes mature at the end of the first half of the menstrual cycle. Ovulation also depends on the duration of the menstrual cycle. Ovulation usually occurs on the 14th day. The probability of getting pregnant at this time is the most maximum. If the menstrual cycle is from 21 to 24 days, then ovulation occurs on 10-12 days. But the cycle is not strictly constant. The difference in its course is from 3 to 7 days. This, accordingly, shifts the period of the shade of the egg.
There is an opinion that, due to taking hormonal drugs or other drugs, additional ovulation can occur on any day of the cycle (menstrual). To identify the moment of ovulation, there are various methods, but it is quite difficult to find out the exact date.