If you breastfeed postpartum, you will generally have menstruation within 6 months to one year. If milk powder feeding is the main method after delivery, cesarean section will be performed in two or three months. If you don't breastfeed, you will generally menstruate 42 days after delivery. If you breastfeed, you will generally menstruate 4 to 6 months after delivery. Lactating women have menstrual cramps later, usually about half a year after delivery, or after the end of the whole lactation period, no matter which phenomenon is normal.