Our 5 week old spits up a LOT and is very gassy. We have tried everything I and our doctor can think of at this point - slow flow nipples; upright feeding position; burping after each ounce; gripe water; simethicone; nothing seems to work and he is constantly uncomfortable and constantly eating (presumably because he spits up so much). He sleeps with a wedge for reflux and still squirms and grunts all night. Any advice?? Please???