The fetus usually enters the pelvis around 37-38 weeks of pregnancy, but due to the varying physical condition of pregnant women, it is possible to go into labor 1-4 weeks after entering the pelvis, and the exact time of delivery will depend on how long it takes for the cervix to dilate. If the mouth of the uterus is open, the labor will usually go into labor and delivery soon. If the abdominal pain is severe, it is considered to be contractions, it is recommended to go to the hospital to check the degree of dilatation of the cervical opening, check the intensity of contractions, and the frequency of contractions, so as to determine the general time of labor. How long it takes to give birth should be judged according to the specific situation: 1, primigravida: about 2-4 weeks after the pelvis may be delivered, the specific time can not be accurately predicted, there are some individual differences. Fetus in the growth and development process is affected by many factors, so the time of delivery will be different.2, women in labor: in close proximity to the labor will be pelvic, about 1-2 weeks after the pelvic will be delivered, there are women in the process of labor pelvic, has given birth to pregnant women are relatively loose pelvis, so the delivery of the fetus after the pelvic time will also be earlier. When the fetus enters the pelvis, the pregnant woman will feel bouts of abdominal tightness or swelling, irregular contractions, and frequent urination, but this is not a sign of labor. Only regular contractions, redness and breaking of water indicate labor. Pregnant women are advised to be ready for labor at any time after the fetus has already entered the pelvis, and to be careful not to engage in strenuous exercise during the day to avoid preterm labor.