For women who breastfeed after delivery, menstruation usually resumes around 6 to 8 months after delivery, while for women who do not breastfeed after delivery, menstruation usually resumes around 6 to 8 weeks after delivery. This is because breastfeeding after childbirth produces a large amount of lactogen, which suppresses the endocrine function of the ovaries, resulting in the inability of the ovaries to ovulate and the inability of the ovaries to secrete estrogen and progesterone periodically, which is why the resumption of menstruation is delayed, and therefore the ovaries gradually resume ovulation about 6 to 8 months after childbirth because of the slow decrease in lactogen. Some women may continue breastfeeding throughout the entire period. Some women may not resume menstruation during the whole breastfeeding period due to the effect of lactogen, so they need to resume menstruation after weaning, while some women may resume menstruation earlier than two months after delivery due to their physical condition or genetic factors. However, for women who are not breastfeeding, since there is no lactogenic effect, the return of menstruation is only about 6 to 8 weeks after delivery. Therefore, no matter how long it takes for a woman to resume her period after giving birth, as long as she is not pregnant, there is usually no need for any treatment.