Almost all pregnant mothers know that “one day in the mother’s womb is better than three days outside” and that an early birth before the 37th week can have certain effects on the baby. However, some pregnant mothers are reluctant to go to the hospital to induce labor even after their due date has passed. It also has an effect on the baby. In terms of normal pregnancy, a newborn born before 37 weeks of pregnancy to 42 weeks of pregnancy is called a full-term baby. And those who are not delivered at 42 weeks and above are called term pregnancies. The perinatal mortality, morbidity and cesarean section rates are greatly increased by the duration of pregnancy. Delayed or even overdue pregnancies are of no benefit to the fetus. It is most often manifested by placental aging. The placenta is the link between the mother and the fetus. The mother supplies nutrients to the baby through the placenta, and metabolizes the baby’s metabolites. Mild placental aging can be compensated for, while severe placental aging can cause intrauterine hypoxia and even fetal death. The decrease in amniotic fluid is another manifestation of placental aging. Amniotic fluid is a protective cushion for the fetus during the delivery process, and too little amniotic fluid makes the baby receive direct pressure from the uterus during contractions, resulting in fetal stress and oxygen deprivation. Pregnancy that is overdue makes the baby’s skull harden and less malleable, making it more likely to have a difficult delivery and increase the chances of a cesarean section. In the event of an overdue pregnancy, the first thing to do is to check the correct gestational age, then perform an ultrasound to check the amniotic fluid and placental function, and choose an appropriate method to terminate the pregnancy.