If the second pregnancy is delivered by cesarean section, the best time to do so is around 39 weeks, so that the fetus’ lungs are already developed. Usually, 37-42 weeks of pregnancy is considered a full-term pregnancy. If the first child was delivered by cesarean section, after the second child is conceived, the oversized uterus will cause damage to the original incision scar, so try to end the delivery a little earlier. It is recommended that the surgery be performed around 39 weeks, when the fetus is in a better condition, the survival rate after birth is high, and the probability of postpartum hemorrhage and other postpartum complications is relatively low, and the incision scar of the pregnant woman will not be damaged. If the first child is delivered by normal delivery, it is recommended to choose normal delivery for the second child, which is beneficial to the development of the fetus and the postpartum recovery is relatively faster than that of a cesarean section. Patients who are going to have a cesarean section for their second child must pay attention to the changes in fetal heartbeat, placental maturity, amniotic fluid volume and other indicators, and also strengthen the blood pressure, blood sugar, heart and kidney function tests of pregnant women.