Contractions can be initiated even when the baby is not in the pelvis, and the initiation of contractions is not directly related to whether or not the baby is in the pelvis. Fetal pelvic insertion is the process in which the exposed part of the fetus passes through the pelvic inlet and enters the pelvis. The normal pelvic insertion of the fetus is the basis for a smooth delivery. A primigravida usually inserts the pelvis 2 weeks before labor, while a termigravida most often inserts the pelvis before labor. However, after full-term pregnancy, even if the fetus does not enter the pelvis, contractions will occur due to changes in hormone levels in the body. In medicine, the initiation of labor is the result of a combination of factors such as inflammatory cytokines and mechanical stimulation, and is not directly related to whether or not the fetus is in the pelvis. In many cases, the head of the fetus does not enter the placenta until after the contractions have started. Therefore, as long as a systematic examination is carried out to determine that there is no cephalopelvic disproportion, there is usually no major problem. It is recommended that pregnant women pay attention to increasing exercise after 36-37 weeks of pregnancy, such as doing yoga appropriately, which is conducive to fetal pelvic insertion.