Cesarean section 39 weeks, 40 weeks can be, if not accompanied by obvious abnormalities can be maintained can be better to 40 weeks. 39 weeks, 40 weeks of pregnancy, the fetus has matured, are able to cesarean section. However, if the fetal amniotic fluid does not decrease, the fetus does not have hypoxia, etc., wait until 40 weeks to do a cesarean section is better. Late pregnancy need to increase the number of pregnancy tests, self-counting fetal movement, pay attention to review the situation of the fetus in the uterine cavity, follow the doctor’s instructions for hospitalization, do not wait until the amniotic fluid is cloudy, reduced, aging placenta, the sight of red and then go to the operation, which will increase the risk of the operation, and also have a very negative impact on the mother and child. Specific cesarean section what time is the most appropriate surgery, or different from person to person, need to follow the doctor’s advice to choose the right time to be hospitalized to wait for delivery, if there is an abnormality at any time when necessary to terminate the pregnancy.