Under normal circumstances, the location of the pubic symphysis is at the junction between the lower abdomen and the legs of the human body, and the bony protrusion can be felt by touching the hand down on the lower abdomen. The anterior pubic symphysis is not very important for men, but for women it is an important anatomical landmark, the upper edge of which is the beginning of the female pelvis and the beginning of the female bony birth canal. The circumference of the upper border will be compared with the head diameter of the fetus, and if the head diameter of the fetus at term is greater than this circumference, it may cause difficulty in delivering the fetus.