A.D.
My midwife told me that being on the regular pill and breastfeeding can cause enlarged breasts in the baby. I have no idea how much milk they have to be drinking for that to happen, but it would be something to look out for. I don't think it hurts the child, but if they are having a reaction to the hormone, it might be better to not be taking it. Also, just because you don't see a reaction, doesn't mean that it doesn't affect them in the long term. As someone said before, you should talk with your doctor, or even a pharmacist and see what they have to say about it.
Good luck!
A.