Yes, you can take birth control pills while breastfeeding; however, you should use caution. Progesterone-only pills are called "the mini pill" and have the least effect on a woman's milk supply of all the hormone types of birth control. Although, most women do not have a problem with progesterone-only pills affecting their milk supply, there have been some women that are sensitive to any hormones and will produce significantly less milk while taking any hormones. If this is the case, talk to your doctor about finding an alternative form of birth control. As an alternative, birth control methods that do not have hormones like barrier methods or non-hormonal IUDs do not affect a mother's milk supply.