Alpro do a child's milk what has all of the essential vitamins for a child in the milk if you want to get him off baby cows milk. Buy the alpro child's milk for him. One quick Google you can probably find vegan child vitamins what are safe and have all the stuff in there for a child's development. It seems like you making it more difficult then it is. I know you don't want to mess you child's health up, so speak to your gp about it they will have resources of where to get vegan supplements safe for children. First of all try the alpro child's milk. The dairy industry takes away children from their mother, so supporting that is probably what you solely against.