B.B.
My son has the same issue. If milk or butter is one of the ingredients (a small ingredient) he is fine but no buttercream frosting, cheese, or milk. He is 4 and he has been off dairy since age 2. I give him a variety of supplements as we wont drink any form of "milk". You can also give him fortified juice or granola bars. I give my son Lil Critters Calcium and also Animal Parade Calcium. I also give him liquid calcium with his fish oil every night. Go to the health food store, they can help you out.