C.M.
My daughter had severe reflux and I agree with the other post that this doesn't quite sound like reflux. Usually that starts at a younger age and they start to outgrow it when they're on solid foods. My recommedation would be to write down everytime he throws up - what time it is, what did he eat last, how long it has been since last food or bottle, was he upright or lying down after a bottle, any other symptoms like diarrhea or fussiness before throwing up... See if any kind of pattern develops. I hope you can pinpoint the problem soon so he can start feeling better - not to mention, no one likes cleaning up puke!