The process of delivery is divided into three stages of labor, the specific time of delivery varies according to the physical condition of the pregnant woman, generally 8-20 hours for first-time mothers. 1, the first stage of labor: this stage from the beginning of the pain to the cervix fully open, generally takes 8-16 hours. After the birth of the fetus, the cervical opening needs to be 10cm. After the regular contractions, the cervix will shorten to flatten, and the opening will gradually expand to 3cm, which takes about 8 hours, and from 3cm to 10cm, which takes about 4 hours. Generally, after the opening of the cervix to 3cm, the cervix becomes soft, thin and elastic before pain medication is used. 2. Second stage of labor: This stage takes 30 minutes to 3 hours from the full opening of the cervix to the delivery of the baby. If analgesics are used, the maximum time should not exceed 4 hours. When the cervix is fully opened and the fetal head is slowly descending, the mother can feel the fetal head pressing on the pelvis, producing strong bowel movements and involuntary straining. After a period of exertion, the delivery of the fetus will begin under the guidance of the physician and nurse; 3. Third stage of labor: this stage takes 10-15 minutes from the delivery of the fetus to the delivery of the placenta, and the longest time will not exceed half an hour. The fetus is usually delivered in the head position. After delivery, the physician will quickly clean the mouth and nose, cut the umbilical cord and check the condition of the fetus. If the placenta is not delivered in more than half an hour, the doctor will have to remove the placenta manually.