Usually, the head of the fetus gradually enters the pelvis around 36-37 weeks of gestation in primiparous women; in transient women, the fetus usually enters the pelvis gradually after contractions. Pelvic entry refers to the entry of the exposed part of the fetus into the pelvic cavity, and in most cases the head of the fetus enters the pelvic cavity first; usually the head of the fetus gradually enters the pelvic cavity at around 36-37 weeks of gestation in primiparous women. The fetus will enter the pelvic cavity later, usually after contractions; after the fetus enters the pelvic cavity, the pregnant woman will feel more relaxed, and the pressure on the stomach will be relieved, and her appetite will also improve; generally speaking, the fetus will enter the pelvic cavity 1-2 weeks after labor, but there are some differences between different pregnant women. Whether the fetus is in the pelvis or not needs to be examined by a professional doctor in the hospital. If the fetus is not in the pelvis when the primigravida is approaching full term, the doctor needs to analyze the possible reasons.