The first stage of labor is divided into three stages. The first stage of labor is from the beginning of regular contractions to the point where the cervix is dilated to ten centimeters. Under normal circumstances, the entire labor process is divided into three stages of labor, the first stage of labor from the beginning of regular contractions to the cervix dilated to ten centimeters. There are differences in the rate of opening of the cervix between different pregnant women. The speed of opening of the cervix differs between primigravid women and menstruating women, with menstruating women being faster. The speed of cervical opening varies in different individuals, and in the same pregnant woman at different stages. In general, the cervical opening is relatively slow during the latent phase, the stage before the cervical opening reaches five centimeters. During the active phase, the cervical opening is relatively fast, i.e. the stage after the cervical opening reaches five centimeters. After the opening of the cervix to ten fingers, the fetus enters the delivery phase, which can normally be completed within two to three hours.