That all depends on whether or not you are breastfeeding. Women who do not breastfeed at all resume their periods the soonest, and may even ovulate as soon as 25 days after delivery. The mean is 45-94 days. Periods usually resume between 6 and 16 weeks postpartum.
In women who are breastfeeding, resumption of periods is delayed, but also depends on how often you breastfeed. In women who breastfeed exclusively without giving any other food or liquid to the baby, periods may be delayed until anywhere from after you totally stop breastfeeding to when you begin weaning and decrease the frequency of breastfeeding. In women who combine breastfeeding with formula supplementation, return of menses is much more unpredictable. The less frequently you breastfeed, the sooner you can expect resumption of your period.
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