I have heard this before also. I had a Dr speak at an ABA meeting once about contraceptives while BFing. I had said that I don't use any hormonal contraceptives as I don't think its healthy to mess with your body like that. She went on to say that its actually a good thing & helps reduce the cancer (breast/cervical etc) rate. It was a long time ago so I don't remember the full details that she went into but it did make sense. Not enough for me to actually go out & get the pill but something to think about.