What kind of formula do you ladies supplement with? When I started supplementing I was using enfamill supplementing formula. Maddie-Jo was really gassy and had a belly ache a lot. I had 2 half can samples of similiac, one was pro advanced and the other sensitive (for gas and fussiness) so I switched over to the sensitive to see how she done with it. She did a lot better, still some gas but not near as much. Now we are at the end of the sample can, do I stick with the sensitive formula or try out the advanced and see which is better before buying new??