The opening of the cervix is also called dilatation of the cervical opening. The cervix is different for each person. Under normal conditions, the opening of the cervix is closed for first-time mothers, and in late pregnancy, the opening of the cervix is about a fingertip away for some pregnant women, especially for women in labor. As the labor progresses, the opening of the uterus gradually expands until it is fully opened to allow the passage of a normal-sized fetus, and the whole process is called opening of the uterus. The whole process of labor is divided into 3 stages, which are also called 3 stages of labor. The first stage of labor is the dilatation period, from regular contractions to full opening of the cervix. The second stage of labor, fetal delivery, is the time from the opening of the uterus to the delivery of the fetus. The third stage of labor, placenta delivery, refers to the process from the delivery of the fetus to the expulsion of the placenta. When the opening of the uterus is complete, it can reach about 10 cm (or ten fingers). During the opening process, there are individual differences in the speed of opening. Generally speaking, the opening of the uterus is slow at first and then speeds up. Most first-time mothers take 8-10 hours for labor, counting from the onset of pain, and may take longer if they have analgesia. Labor is a normal natural physiological phenomenon, and the progress of labor will be closely monitored during this process. Pay attention to the fetal movement, do not have too much pressure on the mind, whether the smooth delivery is mainly labor force, birth canal, fetal position, fetal size and other comprehensive situation.