Humans prepare for labor and delivery by accumulating a gestation period of approximately 280 days (40 weeks). Why do labor pains occur and when do they occur? At present, there is no theory that can comprehensively explain and analyze it. In the early days, it was believed that labor pains and childbirth were caused by the fetus in the womb thinking that the environment outside the womb was better than the environment inside the womb, so it was eager to come out. later