I have found the problem with a2 milk, goat milk, etc is that they have similar protein as cows milk and an allergy/intolerance to the protein is often mistaken for lactose intolerance and since the proteins are so similar, those that react to cows milk will often react to other dairy milk. Ds2 is on soy and we try to give him almond/oat/rice milk but he often refuses them. Luckily if he is refusing all milk, he still takes his mummy milk