Not only in ancient times, but also in modern times, infant mortality and maternal mortality of women are quite high. Investigate its reason, this is determined by people's own physiological structure. People have unparalleled brain and brain capacity disproportionate to the body, just like a computer with super-advanced CPU; ; The problem is that the skull is very big. However, the birth canal will not increase because of the increase of human brain capacity, which will bring difficulties in childbirth. However, from crawling to walking upright, the changes of pelvic structure aggravate the reproductive difficulties of people.

Until modern times, with the maturity of midwifery technology and obstetric planning technology, people got rid of the threat of dystocia to women and babies to a great extent, which brought about the reduction of maternal mortality and infant mortality.