Harpy - no one is arguing that breastfeeding is without risk in the very particular cases of HIV/AIDS, and the very rare cases of meds, radiation or chemotherapy. For goodness sake.
Face it. You don't know the literature enough to make sweeping statements about 'more studies which do not take education etc etc' into account.
Weight of lit. is not assessed by counting up the studies, but by making a judgement of quality studies, and really, I don't see how you come to the conclusion that 'studies comparing breastfeeding with formula tend to be highly contradictory' - do share how you come to this conclusion, where studies 'tend' to be contradictory, 'cos it's news to me.
I am not sure what you mean, anyway....you mean they contradict each other ie study A contradicts study B? I can only think of one area - intelligence - where that has happened (study A says babies are more intelligent if bf and study B says no difference...when along came study C which revealed that there is a genetic component which affects the take-up of 'IQ' factors in breastmilk, which only 9 out of 10 babies actually have).
Find me the quality studies which say formula fed babies are healthier than babies breastfed according to the physiological norms (or actually, even any bf will do) and we can start talking. Please omit outlying cases like HIV/AIDS, mothers having chemo, mothers having heavy-duty psychtropic meds. I thank you.
There is no difficulty whatsoever in finding an 'emphatic clear answer', however. No one has used the term 'health liability' have they? Though I think I might start using it - that's what formula is, in public health terms, for sure. It's not like smoking, I agree - adults choose to smoke, and no one has to smoke; babies don't choose to have formula, but of course they have to have it if not breastfed.