A.M.
Hello, my baby was breastfed and then weaned herself at 9 1/2 months. So I started with formula (at the time she refused milk and it would make her throw up). At 13 months she weaned herself from formula. Just refused it. So now she is drinking regular milk without any problems. So it may happen for you, too sometime.
Also wanted to say you should not give your child rice milk. It is just sugar-water. It is appropriate as a cooking substitute but should not be used as a drink. Also soy milk is not good, see www.mercola.com.
Also you should not give your child orange juice with calcium because orange juice has the highest concentration of pesticide of any food. They do not wash the pesticide off the oranges before squeezing them into juice.
Our family drinks raw milk because my son had issues with pasteurized milk at 12 months. Turns out most people are allergic to the pasteurized casein, and have no problems with raw milk. The enzymes needed to digest the milk are destroyed during pasteurization. I thought it was crazy at first to drink raw milk, but the more I read, the more I was convinced. (www.mercola.com and http://www.realmilk.com/. If you live in metro Atlanta, someone can give you a sample for your boy to try. But it sounds like he may need a little more time.