Aunt refers to menstruation. Menstruation occurs about 2 months after childbirth if you are not breastfeeding, and about 6 months after childbirth if you are breastfeeding. 1. Non-breastfeeding: The timing of menstruation after childbirth is closely related to whether or not you are breastfeeding. Women who are not breastfeeding will have a quicker return to menstruation after delivery, usually about 2 months after delivery, with the change of hormone levels in the body, the estrogen level rises, and normal menstruation can be resumed. 2. Breastfeeding: Breastfeeding women’s postpartum menstruation recovery is slower, because during breastfeeding the body will secrete more prolactin, and estrogen levels are lower, so it will not come to menstruation, usually in half a year to a year, if the extension of breastfeeding, it may continue to push back the menstruation. 3. Pathological factors: other women themselves have polycystic ovary syndrome before pregnancy, premature ovarian failure and other diseases that affect menstruation, resulting in pre-pregnancy menstrual cycle is not very regular, then, her post-partum menstruation recovery time will also be difficult to predict. If menstruation does not occur for a long time, medical examination is needed to rule out pathological factors.