My four and a half month old over the last week has become disinterested in her bottle of milk. She's constently figitty, eyes all around the room concentrating on everything exept drinking her bottle. Ive tried putting her in her car seat to feed her and propping up her bottle making it difficult to concentrate on things going on around her. Burping her more often. etc I just feel like im force feeding her. Fighting with her to drink her milk. Im beginning to get worried as this happens with every bottle. Any advise.