After confirming that after pregnancy, both the husband and wife eagerly hoped to know how the baby would be born in the year, that is, the baby’s due date.Generally speaking, women’s pregnancy is generally about 280 days.So how to calculate the due date?
1. Calculate based on the last menstrual period
This method is the most commonly used and easier. If the menstrual cycle of pregnant women is very regular, it can be calculated by formulas. From the first day of the last menstruation, the month is reduced by 3 or 9, and the number of days will be 7.If calculated according to the lunar calendar, the month is also added 9 or 3, and the date should be added by 14.For example, the first day of menstruation is May 24, 2011, and the due date should be February 31, 2012; the first day of the last menstrual period is April 24, 2011, and the due date should be February 8, 2012.
2. Calculated according to the date when the early pregnancy reaction occurs
Some women’s menstrual cycles are calculated according to the date of early pregnancy reactions, or the last menstrual date is forgotten, or postpartum and post -mortal menstrual menstruation is still pregnant again.As long as you remember the time when nausea and vomiting such as early pregnancy occur, it can also be used to calculate the due date.Because the general early pregnancy reaction appears around 6 weeks of pregnancy, the calculation formula is: due date = early pregnancy reaction date + 34 weeks
3. Calculate by the date of fetal movement
The prestigious maternal fetal movement appeared in about the 18th gestational week. Because of the experience, the mother had experienced the fetal movement 2 weeks earlier than the first mother.Therefore, the calculation formula is: the expected date of the first maternity = the date of fetal movement + 22 weeks of the maternity due to the maternal due = fetal movement date + 24 weeks
4. Calculate according to the results of B -ultrasound
B -ultrasound testing the fetal sac, the tire of the fetus, the diameter of the fetal head, or the diameter of the length of the fetal femoral femoral, and use the measured value to compare the normal value table.For due date.
5. Press the sexual intercourse date that causes pregnancy
The 266th day from the date of sex, is the scheduled date of delivery.
6. Calculate at the height of the uterine bottom
The measured height of the measured uterine bottom is compared with the normal value table. It can be seen that the considerable period of pregnancy is the expected period of 40 weeks at this date.Under normal circumstances, the actual delivery date and the expected period of calculation may be 1 to 2 weeks.