K.S.
I had tried several different formulas with my daughter and the one that seemed not to bother her was the Carnation Good Start(not sure it is the same one you are refering to or not) because it digested better and she also had issues with her stools and constipation. After she was a little older we switched to the Carnation Follow-up which was the next step up after she was a little older and that one agreed with her just as well. We also used the Platex Air-Vent(not sure on the name) bottles that are curved and have a vented bottom, seemed to be less air Good luck with the feeding issues as they can be so frustrating.