My child is 4'4" and is 10 yrs. old. He is allergic to all milk, products and by products of milk, he stops breathing. He is very, very active in little league baseball and travel ball, but is interested in little league football in the fall. I homeschool and was trying to find ways to increase his weight safely, to try out, when I came across this site and spoke to other parents with children his age and realized he may be really under weight. What can I feed him and is he grossly under wieght. I did have problems gaining weight growing up. I to drank instant breakfast and milkshakes to gain, but with his allergy, what can I do?