Hello! I have a 4 month old baby girl, and we've been having some troubles feeding her lately. She has taken the bottle from day one, as we needed to supplement my breast milk with formula. She now gets exclusively formula. We will generally make her a 6 oz. bottle, and she'll eat maybe half of it, then burp, then will act like she doesn't want anything to do with it and start fussing. I am concerned if she keeps this up, she won't get enough to eat. Any ideas or suggestions on things to try?