The level of fetal head descent is marked by the sciatic spine, which is the bony elevation of the sciatic body between the greater and lesser incisions of the hip bone, and the level of the sciatic spine is usually used as a marker to determine the height of the fetal head. Fetal head descent is manifested in the 1-2 weeks before formal delivery, when the uterine fundus drops significantly and the abdomen protrudes forward to the lower part of the body. At this time, fetal movement is less than before, and the upper abdomen feels more comfortable, breathing is lighter, appetite increases, food intake increases, and there is a sense of relaxation in the abdomen. At the same time, due to the drop of the previa, the pressure on the pelvic connective tissue, bladder and rectum, pregnant women will feel a feeling of swelling in the lower abdomen and discomfort such as frequent urination, frequent bowel movements, back pain and leg pain, etc. At this time, the fetus and fetal heart rate should be closely monitored. In addition, during the late pregnancy, the fetal head may stall in the process of descending, if it lasts longer than a certain period of time, the delivery must be assisted immediately in order to prevent the newborn from suffocating if the time is too long.