Labor needs to be induced when the pregnancy is 1 week past the due date, i.e., when the pregnancy reaches or exceeds 41 weeks. If the baby is not delivered at full term, its placenta will gradually age, causing a significant decrease in blood flow in the intervillous space, thus reducing the delivery of oxygen and nutrients to the fetus. It may also be accompanied by a decrease in amniotic fluid volume, which can cause intrauterine hypoxia and even endanger the life of the fetus in severe cases. Therefore, once the delivery date is one week past the due date, it is recommended to induce labor in time to avoid critical situations such as intrauterine hypoxia. However, there are some pregnant women who have irregular pre-pregnancy periods, which may lead to deviations in the projection of the due date, and the actual growth of the fetus can be clarified through ultrasound examination. If there is no abnormality, the baby can be observed and there is no need to induce labor. In addition, pregnant women who are actually overdue for delivery but are not sensitive to oxytocin can deliver the baby by cesarean section if necessary.