I.V.
Processed soy milk is not the best thing to use, esp. for children. It causes a lot of problems later in life. You can find info on that on mercola.com.
I would try organic raw goat milk ( I can buy it on the farmers market in PA, but you can buy org. goat milk at the health food stores as well). It is known that goat milk can be drinken by individuals who have milk allergy, also it is lot more nutritious then cow milk from the grocery store even if its organic.
I.