A.F.
My daughter started spitting up around 4 1/2 months and it was often and seemed like a LOT. I asked the dr. and he told me that some babies are just spitters (I was too according to my mom). The Dr. told me that as long as she was a "happy spitter" (no obvious pain or discomfort) then not to worry about it. A lot of people told me that she had severe reflux, but I trusted my dr and decided to wait it out ... she is an extremely happy baby and her disposition never changed. Anyway, she ate well, gained weight and was happy so we just resigned ourselves to dealing with it...lots of burp rags, etc. around everywhere. The formula stained like nothing I've dealt with before and I was frustrated. But, then it just stopped as suddenly as it started....I'd say about 6 months old. I honestly think that her muscles were still developing and that was what the problem was.
Well, good luck and I hope your little one is feeling better soon!