Hi,
My baby had it bad! The ped ended up prescribing Zantac for him. He doesn't need it anymore (at 7.5 mo), but he still spits up. The Zantac doesn't stop it, it just neutralized the acid so he wasn't in pain. If you give your baby formula, Enfamil A.R. (added rice) is thick and really helps. It's worth a try if you are not BF'ing.
My cousin's baby spit up so much that he wasn't gaining weight, so the dr. put him on something else that actually kept the food down. He is find now, too (one year).
Good luck!
-Jen