It is normal for a woman to menstruate at 12 weeks after giving birth while breastfeeding. Women resume menstruation after giving birth is mainly divided into two situations: first, breastfeeding women will resume ovulation and menstruation after 12 weeks, there are a lot of breastfeeding women will be delayed until 18 weeks to be able to resume normal ovulation and menstruation, there are also a lot of women will not be able to have normal menstruation after giving birth. The main reason for this is hyperlactatemia, because the elevated lactation hormone in the female body will lead to abnormal ovulation cycle in breastfeeding women, and they will not be able to ovulate and have menstruation. Secondly, women who are not breastfeeding will resume menstruation after 6 weeks, and the first post-partum menstruation will be heavier, and will return to normal later, so don’t worry too much.