Prenatal labor pains are caused by uterine contractions, and the time after the onset of labor varies from person to person, usually taking 10-20 hours for first-time mothers and 6-8 hours for menstruating mothers. The labor pains usually indicate the onset of labor and are characterized by regular paroxysmal pains in the lower abdomen, with gradually increasing duration and decreasing intervals. The duration of labor is dependent on the woman’s physical condition, labor force, size of the baby, and the mental state of the mother, so it is impossible to make a generalization. Usually, for the first child, the whole labor process is longer, especially when the first three fingers are opened, and the contractions are 4-5 minutes before the labor process starts, and it takes about 11-12 hours to deliver. It is recommended to try painless delivery, which can increase the confidence of pregnant women in vaginal delivery and reduce the rate of cesarean delivery.