Try giving your baby a few drops of Mylanta infant gas drops before feeding him the bottle. (there is another brand as well but it is not coming to mind) And if after they have drinkin the bottle and are still gassy I gave another drop or two of the drops. You can find the infant gas drops in the pharmacy aisle with other gas relief stuff like rolaids, tums etc..or ask your pharmacist. My kids lived on this stuff and I had no more projectile vomiting or gassy tummies. And believe me my first born he could hit a wall across the room before I gave the infant gas relief drops a try. I feel your pain...hope it works for ya!