The early menstruation after childbirth is not obviously related to the fast thinning. The early menstruation of women after childbirth is mainly due to the better physical quality of women after childbirth and the normal level of hormones secreted by the ovaries. The normal secretion of estrogen and progesterone can act on the endometrium, so the endometrium will undergo periodic peeling, that is, the onset of menstruation. Women who have a normal sex life need to take good contraceptive measures to avoid unwanted pregnancies when they have their periods. Women in the postpartum thin fast is mainly with women’s diet and nutrition, rest, and then the postpartum exercise has a certain relationship. If women in the postpartum eat more food is vegetables, fruits, eat less meat, high protein food or sleep quality is poor, more exercise after giving birth, after giving birth to take care of the baby is very hard, so women will be thin faster.