When will my periods return?
After birth, your periods will return at your body’s own pace. It’s possible for your periods to return as soon as 4 to 6 weeks after childbirth.
If you bottle feed or partially breastfeed your baby, you’ll tend to start having periods sooner than if you exclusively breastfeed.
If you choose to breastfeed exclusively, your first period may not return for several months. For those who keep breastfeeding, it might not return for 1 to 2 years.
https://www.pregnancybirthbaby.org.au/amp/article/periods-after-pregnancy