J.F.
I don't think the green color is a problem. I think my pediatrician says green was from a lot of carbs. Can't remember tho. I had breast feeding troubles so I pumped exclusively for the first 3 mos. My supply decreased, so I had to start using formula. First just one bottle a day. Once I was up to almost half formula per day, that's when I noticed problems with gas. Now my son is fairly gassy, but at this point, it was clear that the gas was causing him to be uncomfortable, fussy, and cry. I had originally used regular Enfamil. I switched to Gentlease, but my husband & I did not care for the primary ingredient being corn syrup solids (or something like that). The formula was very sweet & sticky. We ended up switching to Nestle Good Start. The one we used was actually a bit more expensive, but no more gas pains & troubles. Perhaps you need to try other formulas