Hi, I introduced cows milk to my baby at 11 months as like you I had finished a formula and was advised to go straight onto cows milk, he was fine with it and has had no issues going to cows milk. After about a month later and several doses of head colds and being sick I thought that maybe I should of kept him on formula as there is so much good stuff for them (probiotics, Iron, Zinc etc) especially mixing with lots of kids at daycare, that cows milk does not offer. He eats very well but I just didn't think it was enough. I tried to get him back to taking a bottle of formula but of course after tasting cows milk he didn't want formula. Bailey is 14 months and he gets cows milk in his bottle then for breakfast I make him wheatbix with a bottle of formula in it, he loves it and I get his formula into him. I know formula is more expensive than cows milk but I think it is important that he gets everything his little growing body needs. Good luck.