When a woman is pregnant, the placenta is attached to the lower part of the uterus or the cervical opening due to damage to the endometrium or an oversized placenta, resulting in placenta previa. In the process of delivery, the uterus will have rhythmic contractions and the fetus will need to descend. Due to the placenta blocking the front, the fetus cannot break through the placenta and be delivered smoothly, and in this process, due to repeated squeezing of the placenta, the blood supply to the placenta is insufficient, which may even lead to fetal asphyxia or even death. If the placenta previa is only marginal or only a small part of it is at the inner cervical opening, which does not affect the descent of the fetal head, and the labor progresses smoothly, the fetus is small, there is no intrauterine asphyxia, and the opening of the uterus is more than 4 to 5 cm when the pregnant woman comes to the hospital, and there is no increase in the bleeding of the placenta during labor, it is also possible to try to deliver the baby, but during labor, once there is more vaginal bleeding, intrauterine asphyxia, fetal asphyxia, and fetal asphyxia, the placenta can be delivered. However, in the event of more vaginal bleeding and intrauterine asphyxia, it is necessary to change to cesarean section immediately. Therefore, if a woman has placenta praevia, she should choose to deliver by cesarean section as much as possible under the guidance of her doctor. After all, 10 months of pregnancy is very hard for women, so when the placenta praevia occurs, try to choose not to deliver under the guidance of the doctor, choose a cesarean section will be safer.