The fetus should stay in the mother’s body for 10 months, and the date should be calculated from the day of the last menstruation to the expected date of birth, which is 10 months. The fetus should stay in the mother’s body for 28 days per month, 10 months should be 280 days, half a month earlier or half a month later than the expected date of birth is a normal performance. If ovulation is early, the fertilized egg will be laid early, which will easily lead to an early due date, and if the fertilized egg is laid late during ovulation, which will easily lead to a delayed due date, as long as the delayed or early time does not exceed half a month, it is a normal phenomenon during this period. During this period, pay attention to check the change of fetal heartbeat and observe the amount of amniotic fluid, as long as everything is normal, there is no need to induce labor.