Because of the specific degree of opening of the uterus, as well as the opening of the fetal descent and maternal labor situation is different, so how long the opening of the uterus can be born varies from person to person, the specific analysis is as follows: 1, primiparous women: the first stage of labor can be divided into the latent period and active period, the latent period is the slow stage of the expansion of the uterus, the active period is the accelerated stage of the expansion of the uterus, the opening of the uterus of primiparous women to 6 cm before entering the active period. Therefore, the first stage of labor usually takes about 11-12 hours for primiparous women, which can vary from one individual to another. The second stage of labor is usually less than 2 hours after the opening of the uterus, but some primiparous mothers with low labor force or large fetuses may have a prolonged second stage of labor. The third stage of labor is the process from the delivery of the fetus to the delivery of the placenta, which usually takes about 15 minutes; 2, the women in labor: the first stage of labor can enter the active stage when the opening of the uterus is 4-5㎝, and the first stage of labor usually takes about 6-8 hours. The second stage of labor is smoother than the first stage of labor, generally not more than 2 hours. The third stage of labor is after the delivery of the fetus, and the time gap is usually smaller, also about 15 minutes. Pregnant women need to preserve their strength and adjust their mindset during labor to avoid excessive anxiety and nervousness that may affect the labor process. You can get out of bed and walk around with the help of your family to speed up the opening of the uterus. If the progress of labor is not smooth, or the time is prolonged, it will easily lead to hypoxia, so the fetal heart rate should be monitored regularly during labor, and if labor is stalled or the fetus is in intrauterine distress, the labor should be transferred to cesarean section in time.