Periods are clinically referred to as menstruation, and there is generally no good or bad reason for menstruation during breastfeeding. In general, the return of menstruation in non-breastfeeding mothers occurs 6-10 weeks after delivery, and the return of ovulation occurs on average about 10 weeks after delivery. In breastfeeding women, the return of menstruation is delayed, or even absent during breastfeeding, and ovulation resumes on average 4-6 months after delivery. Those who return to menstruation later after delivery often ovulate before their first menstrual period, so breastfeeding women have the possibility of conception before menstruation resumes. If you have sex after giving birth, you should take proper contraceptive measures to prevent another pregnancy. Since the body is still recovering from childbirth, it may not be healthy for the woman to get pregnant again soon. Besides, the hormone level will change after pregnancy, which may affect the milk production of breastfeeding women. Women should seek medical checkups if they feel unwell after delivery.