It's hard to be exact about when your periods will start again, as everyone is different.
If you bottle feed your baby, or combine bottle feeding with breastfeeding, your first period could start as soon as 5 to 6 weeks after you give birth.
If you fully breastfeed (including at night) without any bottle feeding, your periods may not start again until you stop breastfeeding, or until you stop night-time breastfeeding.
This is because the hormone that causes your body to make breast milk can stop your body making the hormones that control your periods.
As your baby starts breastfeeding less often, around 3 feeds a day, you may start "spotting". Spotting is a light and irregular period that usually appears as spots of blood.
You first period may be different from how your period was before.
You may have:
If you have had blood clots in your period that have lasted a week, or have much heavier blood loss than you have had before, you should speak to your midwife, health visitor or GP.
You may be able to get pregnant as little as 3 weeks after the birth of your baby, even if your periods haven't started again yet.
Read about sex and contraception after birth.