I breastfed til DS was 6 months old and now use formula. I use one that was recommended by a friend and have had no probs.
I'm interested to know because a friend who bottle fed her ds since he was 2 weeks old, has been advised by her GP to change the brand she uses because her little boy has had a few tummy bugs (one of which got quite serious) and he told her to buy a certain brand because it had prebiotics in.
I've read on other threads that some formula milk manufacturers just have better pr than others and wondered whether she's being mis-advised.