Because the process of giving birth involves the delivery of the fetus through the woman’s vagina, spreading the legs apart helps to open the way for the fetus to be delivered. When a pregnant woman gives birth, the baby is delivered through the uterus, cervix, vagina, and then through the vaginal opening. If a woman clamps her legs, then the vaginal opening is in a closed state, and the birth canal and pelvic outlet will become smaller, then it will affect the delivery of the fetus, so a woman needs to split her legs in the process of giving birth. The fetus is delivered through the vaginal opening. Before the opening of the uterus to the delivery of the fetus, women can choose to use the squatting position, kneeling position, sitting position or supine position and so on. The aim is to open the legs sufficiently so that the passage is open for the delivery of the baby.