If you are a breastfeeding mother, you may get your regular period back a few weeks after birth (about 28 weeks after birth). However, this can be different for every woman. Some women may get their period back sooner, or some do not get any periods while breastfeeding, this called (Lactational Amenorrhea Method (LAM)
L= Lactation means breastfeeding
A= Amenorrhea means having no monthly period
M= Method
Breastfeeding exclusively can stop you from ovulating, but even though many unplanned pregnancies happen in the first few months after birth , so it’s much safer to arrange other forms of contraception after giving birth, especially when your periods have returned.