After the fetal prelude has entered the pelvis, pregnant women will experience a sense of relief in the upper abdomen, frequent urination, constipation, frequent contractions and other symptoms. 1. Relaxation in the epigastrium: when the prenatal prelude is not in the pelvis, the fetal head or buttocks located in the epigastrium will compress the heart, lungs and stomach; after the prenatal prelude is in the pelvis, the pressure on the organs will be lifted, and there will be a sense of comfort in the epigastrium, a little bit lighter and faster respiration, an increase in the volume of the stomach, and a feeling of hunger. 2. Frequent urination and constipation: The pressure on the bladder and rectum after the fetal prelude enters the pelvis will cause frequent urination and constipation. 3. Frequent contractions: The pressure on the vagina and pelvis after the prenatal presentation of the fetus into the pelvis will stimulate contractions and cause frequent contractions. It is recommended that women during pregnancy should have regular checkups, and if the head of the fetus does not descend near the due date, they should exclude the presence of a large child or pelvic stenosis, and consult a medical professional to choose a suitable delivery method.