My daughter is 4 months and, in the past week, has started to get very unhappy while feeding. She'll gulp down the first 20-50mls then come off, but then refuses to take any more, even after a good burp. If I try to bring the bottle back to her mouth, she turns her head, gags, screams, wriggles etc. She's not taking nearly as much milk as she used to and I just have no idea what to do.
Any ideas what might be causing it? She is showing some signs of teething (dribble, chewing on her comforter/Sophie Giraffe/hands), so wondering if that might be it. Is it normal for teething to have this effect?