I think that my 6 week old son may have a dairy allergy, but I just do not know. Here are his symptoms: bad diaper rash, projectile vomit about two or three times a day, regular spit up, constipation where it hurts him to touch his stomach about once a day, wet burps, hiccups, he is very congested at night and he has smelly breath. Many of these symptoms would make me think that he has reflux but he is not irritable and he is gaining weight fine. I would appreciate any thoughts. Oh, he had an ultrasound today to rule out Pyloric Stenosis and it showed that he was ok.