P.M.
We always used a playtex nurser. My daughter was the same way, even on breastmilk. Another thing that helped us was to keep her upright for at least 30 minutes after eating. I know he is very young, but ask your doctor if you can add a tablespoon of infant rice cereal to the bottle (don't do this without your doctors permission) Thickening his food can sometimes help, but he is really young. Good luck momma, this too shall pass!