My son has a lot of throwing up tendency. He is 3 now. The paediatrician had said he has acid reflux. But its been there for so long now. Does it have anything to do with how he was being fed when he less than 1yr or with him being kept in a tub of tap water in the summers

Just trying giving him small meals... sometimes kids throw up when over fed.

Have you got his lactose intolerance tests done? Read a Mom's story (an article on lactose intolerance) here on BabyChakra. It will give you some perspective

if he is gaining wt and is active..one or two vomits should not worry you...but if he is loosing weight or is not gaining wt as per his age..you should consult and investigate..
Try giving semis olive meals before sleeping and give semi inclining position