Different reasons for the widening of the crotch bone, correction methods are different, as follows: first, childbirth factors: the most common reason is the widening of the crotch bone after childbirth, mainly due to the time of delivery, the fetal head through the pelvic outlet, the squeeze on the pubic symphysis, which will make the pubic symphysis separation, the pubic symphysis injury, so it will make the pelvis open to both sides. In this case, local massage and pushing on both sides and squeezing the iliac crest with force to both sides can reduce the degree of separation of the pubic symphysis. At the same time, you can also use the pelvic belt wrapped around the iliac crest for pressure, can also restore the separation of the pubic symphysis. Second, hormonal secretion factors: due to the high level of estrogen and progesterone during and after childbirth, it can cause the relaxation of pelvic floor muscles and pelvic floor ligaments. At this time, functional training of pelvic floor muscles can be carried out, such as functional training of anal retraction exercise and gluteus maximus, which can re-increase the tension of muscles around the pelvis and protectiveness of the pelvis, and can shrink the pelvis.