Avoid Contraceptives While Breastfeeding
Pills are absolutely fine unless you are not breastfeeding. Most of the birth control pills reduces the milk supply in mothers if they are in combination of estrogen-progesterone(these are sex hormones).
There are two area of concern while taking birth control pills during breastfeeding:
1. effect on milk production
2. there are some possibility of effect of hormones on baby
contraceptive comes in different type, some are with the combination of both estrogen and progesterone and other are progesterone only (called mini pills) .
There is no evidence that the birth control pill containing only progesterone effect the milk production. So it is safe to avoid pills specially those having estrogen during breastfeeding. Always notice while taking these medicine if you are breastfeeding.