^ I'm not 100% on this but I have heard a few times that babies need full-fat milk if they're going to have cow's milk. DH believes it's because the littlies need bucketloads of fats to help build their brains etc, I'm trying to find some information for you as I type this (will come back and post anything relevant later on, unless someone else gets in first!!). We just gave DD full-fat because we drink it lol, I can't stand low-fat or diet anything haha