A. Yes. Breastfeeding is 98% effective in preventing pregnancy in the first 6 months if you meet the following conditions: your menstrual periods have not yet resumed, your baby is getting no other food or drink besides breastmilk, your baby does not go longer than 6 hours without feeding, your baby nurses at least 8 times a day.

Since birth control pills with estrogen can lower your milk supply, they are best avoided while you are nursing.