The normal duration of pregnancy is 40 weeks, counting from the first day of the last menstrual period. Most of the pregnancies are delivered between 24 and 36 weeks prematurely, after 41 weeks prematurely and between 37 and 40 weeks at full term. Both preterm and postterm births can have certain effects on the fetus. Therefore, pregnant women should pay more attention in their normal life, such as paying attention to regular maternity checkups, paying attention to timely supplementation of calcium, iron and folic acid. Pay attention to ensure sufficient sleep, pay attention to loose clothing, their own hygiene. Pay attention to not lifting heavy objects and not doing strenuous exercise, but you can do some simple exercises to promote metabolism, etc., to ensure that the child is born smoothly at full term.