Ds (10 months) won't drink anything other than milk and today he had managed a whole 11oz! I am getting concerned now. Should I change to follow on milk to ensure he gets more nutrients? I have tried cups and different spouts and different teats and the only thing he will take from is a NUK teat. (I breastfed until he was nealy 8 months.) I have tried giving him a large hole this evening but he still only had 4oz before bedtime.