lindsay- i have been told the same thing - Cows milk is to much for little bubs tummy which is why they have formula specially designed for bubs. i didnt introduce cows milk with my son untill 15 months. He was boob fed til 3 months then i couldnt feed anymore so i switched to formula- he then develpoed reflux and would vomit after every feed (projectile... across the room) i wish i could have boob fed for longer which didnt seem to upset his tummy.
Same goes for soilds, bubs tummys arent ready to cope with them, and when there introduced i sarted with farex.
Hope the little one is ok.