Okay everyone seems to be reading your post differently. Yes, they change eating habits, but the problem I see you are having is more in take of milk from the bottle. I am assuming the actual milk intake is not your major concern, just that he was off the bottle and now back on it again. My guess is that it may be your mom. Your private baby sitter was probably pro active about getting him off the bottle, however your mother coming from the older generation may think that the bottle is easier, that it's ok for a 2 year old to have a bottle, or maybe he asks for it and she is a softy :) She is his grandma after all :). The bottle is probably helping him through his transition and soothing him. I would talk to your mom and try and pick her brain to see how the bottle got started again. See if you can get her to slowly start slipping in a sippy cup every other feeding. Is she giving him the bottle during nap time, is this something you want him to do while going to sleep, etc.... He will start eating again, probably not a big worry, but I would address the bottle thing if it's bothering you. If you are ok with it, then let it go. He will drop it eventually, especially if you put him in day care. Peer pressure is an amazing thing. Plus I don't think I have ever seen an adult walking around with a bottle :). Good luck!! Hopefully I read your post correctly.