You posted on a recent thread that introducing just one bottle of formula can alter the benefits of exclusive BF, so I am asking for your advice! If this is so I am really gutted . I would say that my DS has been exclusively BF (although strictly speaking he hasn't). He was and still is a terrible sleeper, it has always been a nightmare to get him off to sleep at night without several rounds of BF and he has always woken several times in the night, only being settled by BF. With the help of a dummy after 6wks I thought we'd cracked it but he wouldn't take it after about 3mths. Since about 4mths I have given him the odd bottle of formula before bed at night (maybe about 3 or 4 in total) - I was really at the end of my tether and wanted to try anything. (This was before I discovered MN I might add). Needless to say it didn't work.. But I was under the impression that this wouldn't do any harm as he surely had all the benefits of BF. I started him on tiny amounts of solids at around 5mths. He is now nearly 6mths and I intend to carry on BF as long as we both want. If I have jeopordised the benefits of all that BF by just a few bottles of formula, is there a way of getting them back now that he is 6mths?