My DD of 5 months (who has relfux but is under control with meds and gaviscon) has only had 20oz of milk since saturday night,she had her last feed as normal at 7pm sat night and when she woke sunday morning she would only take 2oz. She been taking a few oz here and there but with a real fight. She is on solids and has been taking them fine. She doesn't seem poorly and is very happy as normal. Could this be teeth?