From what I can tell it seems that most of the research suggests that the Warfarin is considered safe for breastfeeding now, my youngest child was 4 last week so its likely that the advice I was given (that I had to continue with heparin injections if I wanted to breastfeed) is out of date. I'd agree that doing some research yourself would probably be a good idea, at least then you'll feel sure about the treatment you decide to take.