The desire to know the date of birth occurs in womenalmost at the same time, when she realizes that she is pregnant. In this difficult matter, I want certainty not only for the future mother, but for other family members. Therefore, the calculation of the date of birth is a responsible matter, which must be approached with all seriousness.
If you think that to determine the daybirth of a baby is enough to add to the estimated date of conception of 9 months, then you are mistaken. Because a normal pregnancy, on average, lasts 10 lunar months, which is 280 days.
So how do you calculate the date of birth correctly? If the date of conception is known, then it is easy to do this. It is necessary to add to this date 280 days, and the date is fixed. But rarely what woman can say with certainty, on what day she became pregnant. Therefore, in most cases, the calculation must be made by the date of ovulation.
Any woman knows how long it lastsmenstrual cycle, as a rule, it is 26-35 days. Ovulation happens, in most cases, in the middle of this cycle. Many women can even feel this condition, because at this time they notice painful pains, as with menstruation, an increase in the amount of whites, and sometimes - spotting spotting. But even if there are no external manifestations during ovulation, it is possible to say with certainty that it passes on 12-14 days (with a 28-day cycle). This date should be taken for the day of conception, to which it is necessary to add 10 lunar months to calculate the date of birth.
By the way, conception can occur and not on that day,in which the sexual act occurred. Since spermatozoa can remain viable for several days. So, it can happen that sexual intercourse happened on the 10th day of the cycle, and conception occurred on the 12th day.
You can calculate the date of birth without asking the dayovulation. A gynecologist at the reception will necessarily ask the patient when her last menstruation starts. That's why all women and women doctors are urged to keep a calendar in which to mark the dates of the onset of critical days. After all, it is from the first day of menstruation that the countdown begins.
Knowing this date, you can easily calculate the dategenera, using the simplest formula of Negele. According to her, it is necessary to take three months from the date of the onset of the menstrual period before pregnancy, and then add 7 days to the received date. For example, the last critical days began on 10 January. We take away three months - we get on October 10. Now add seven days and get the date October 17. It is on this day, most likely, a child will be born.
However, the described methods, telling howcalculate the date of delivery, are not accurate. You can only find out the estimated baby's birthday. After all, not all women have a menstrual cycle is regular. Sometimes ovulation may be delayed, or, conversely, occur before the due date.
Therefore, the most accurate methodology for determiningthe date when the child is supposed to be born is ultrasound. When conducting ultrasound at an early stage, the date of conception can be determined to within one day.
Determining the timing of pregnancy in the second and thirdtrimester, the doctor is guided by the size of the head of the fetus and its limbs. However, in this case it is difficult to accurately determine the date of birth of a small child, because children can develop in different ways.
As you can see, determine the exact date whenthe birth will be very difficult. A certain percentage of mistakes are made by the fact that pregnancy does not always last exactly 280 days. In some cases, women give birth to completely healthy and full-term children on the thirty-eighth week or, conversely, the birth is delayed and falls on the forty-first to forty-second week of gestation. And this duration of pregnancy is not a pathology at all, it's just an individual feature of the body.
But there are certain regularities. For example, in the event that a pregnant woman wears twins, childbirth almost always occurs earlier than in forty weeks.