I have on three occasions tried giving my four month old a little formula (first hipp organic, then aptimil, then nutramigen) each time he has projectile vomited it up after a couple of hours. My doctor suggested nutramigen but that didn't work either. Has anyone else experienced this? I don't think its a lactose intolerance because when he was in the hospital at birth he was given a few bottles of formula with no problems. Thanks