Expected date of delivery according to ultrasound or menstruation can be projected, but the expected date of delivery in advance and push back are possible, pregnancy should be on time for delivery, if the fetus is in normal condition, let nature take its course and wait for the contractions to start at ease to wait for delivery.1, menstruation: usually from the first day of the last menstruation counting a total of 280 days, the 280th day for the expected date of delivery. General menstrual cycle regular women, the expected date of delivery is the month of the last menstrual period minus 3 or plus 9 and the date plus 7, such as the last menstrual period 2017-6-7, then the expected date of delivery is 2018-3-14; 2, ultrasound: general menstrual cycle is not regular women, early in the pregnancy can be ultrasound to check the fetus’s head and buttocks length and skeletal diameter, based on the indicators to predict the expected date of delivery is more accurate. If the expected date of delivery is more than 2 weeks and there is no effective uterine contraction, it is necessary to go to the hospital for examination in a timely manner, combined with the doctor’s opinion of a comprehensive assessment of the mother, and if necessary, assisted intervention, delivery as soon as possible, so as to avoid any impact on the fetus.