So is there really anything wrong with weaning my son at 9 months and putting him right on whole cows milk? I'm getting pretty worn out on breastfeeding and he's getting pretty bitey so I think its time. The problem is, he's never had to have formula and he hates every kind we've tried. He's also not that great at a bottle since he's never had to use one really and he's pretty good at using a sippy cup. Please let me know what you think. He's in perfect health now, quite the big man, I just want to keep him that way.