G.G.
Cow's milk isn't really necessary for kids or anyone else besides baby cows. All the research points to negative health effects like Type II diabetes, ear infections, allergies, bone loss (animal protein drains calcium from your bones) and a host of other health issues.
We have always fed our kids (who are ages 17 months and 4) Organic plain soy milk and almond milk which contain no saturated fat or cholesterol, have necessary dietary fiber and contains 100% usable protein. The calcium in cow's milk is only 32% usable.
Check out the following websites:
Parent's Guide to Building Better Bones:
http://www.pcrm.org/health/prevmed/building_bones.html
The China Study
www.thechinastudy.com
~G. G.