How long after a vaginal delivery does menstruation resume?

In general, the time when menstruation resumes after a vaginal delivery varies among individuals, primarily depending on whether the mother is breastfeeding. If the mother does not breastfeed, menstruation usually resumes one to two months after delivery. If the mother breastfeeds, menstruation typically resumes two to three months postpartum.

If the mother does not breastfeed, the hormonal changes after childbirth are relatively straightforward, allowing the hypothalamic-pituitary-ovarian axis to recover more quickly. The ovaries begin to resume ovulation, and the endometrium regenerates and undergoes cyclical changes under the influence of estrogen, leading to the resumption of menstruation.

If the mother breastfeeds, the infant's sucking during breastfeeding stimulates the mother's hypothalamus to secrete prolactin. Prolactin not only promotes milk synthesis and secretion but also suppresses ovarian ovulation function. As long as breastfeeding continues, the prolactin level remains relatively high, inhibiting ovarian ovulation and delaying the return of menstruation.

It is important to note that regardless of whether menstruation has resumed, effective contraceptive measures should be taken during sexual intercourse while breastfeeding to prevent unintended pregnancy. Maintaining healthy lifestyle habits, including balanced nutrition and moderate exercise, is beneficial for both physical recovery and the normalization of menstrual cycles.