Periods are also known as menstruation, and the timing of menstruation after childbirth varies depending on the woman’s physical condition and the recovery of her uterus and ovaries. For mothers who are exclusively breastfeeding, the period will come relatively late, while for mothers who are mixed breastfeeding, the period may come earlier. In general, the uterus basically recovers around 42 days after delivery, new follicles will grow, mature and ovulate, and menstruation will occur 2 weeks after ovulation. Therefore, most postpartum women who are not breastfeeding will return to menstruation in about 2 months after delivery. In the case of breastfeeding, because of the large amount of lactogen produced in the mother’s body during breastfeeding, and the large amount of lactogen suppresses ovulation in the female endocrine system, the ovaries are suppressed for a short period of time without ovulation, so the menstrual period usually resumes only about 6 months after delivery. In short, the recovery time of menstruation is later for exclusive breastfeeding mothers than for mixed breastfeeding mothers.