To calculate terms of pregnancy and the forthcoming childbirth, there are several methods of definition of exact date of an important event. Each of them is convenient for carrying out calculations in own way.
Instruction
1. The simplest method of definition of date of childbirth – use of the online calculator for future mothers on the websites on the Internet. On the website enter start date of your last periods in the web program. As a result of processing by the program of the entered information you learn estimated day of future childbirth.
2. The gynecologist will render assistance in calculation of date of future childbirth. In this case the doctor determines the term of pregnancy and date of childbirth, proceeding from day of your last periods and the sizes of a fruit when probing walls of a uterus during survey and on ultrasonography. Usually obstetric term of pregnancy is calculated by doctors on weeks. Gynecologists determine date of childbirth on 38-42 week of pregnancy. On such terms the pregnancy is considered full-term and childbirth can occur at any time.
3. The ultrasonography method allows to determine most precisely the number of weeks of pregnancy and term of future childbirth. And will be most optimum to resort to the ultrasonography method in case future mom does not remember precisely day of approach of the last periods. At a research on ultrasonography of the sizes of the growing kid his mom receives additional data on a physical condition of the child, absence of pathologies, polycarpous pregnancy and so on.
4. Calculate in independently mathematical way date of future childbirth. For this purpose by day of approach of your last periods add on one week and subtract from the turned-out day exactly three months.
5. Other way of calculation of presumable date of childbirth: by first day of the last periods add seven days, then count from the turned-out date nine months, according to the calendar forward. For example, in case the last monthly began at you on June 5, then childbirth will be presumably on March 12. Calculation was made here so: 5+7 = On June 12, on June 12 + 9 months = on March 12.