The term “postnatal” here refers to the end of childbearing. The earlier the menstrual period comes after childbearing does not mean that the recovery is better, as some women who have breastfed may not be able to have a period for a while while their bodies have recovered. The timing of menstruation after childbirth is also related to the duration of breastfeeding, and it does not mean that a woman has recovered well simply because she has her period earlier. For women who are not breastfeeding, the ovaries will gradually recover 4-6 weeks after delivery, and the hypothalamus and pituitary gland will be able to secrete hormones normally, and menstruation will occur. Women who are breastfeeding, due to increased levels of lactogen, inhibit the function of the hypothalamus and pituitary gland, will prolong the time of menstruation, but at this time the woman’s uterus and physical condition may have recovered better, it is breastfeeding caused by delayed menstruation, and can not be said that postpartum menstruation comes sooner the better the recovery of the body. It is recommended that women go back to the hospital after 42 days for a checkup to get a better idea of how the body is recovering.