I was also going to suggest that he may be growing out of his dose as doses of meds in kids are weight based. We had to increase DS dose of losec at about 3 months of age because his reflux started to get bad again. Once the increased dose kicked in it was all good again. However I think doing this under the guidance of a good paed (some of whom have been recommended in this thread) would be the way to go. Reflux is awful. I hope you get things sorted out for your little one soon.