Read up on nutrition. I know that in addition to casein, EFAs and other nutrients are crucial for mental development and some children have difficulty breaking them down and receiving what they need. Here's one such link:
http://www.umm.edu/altmed/articles/a...cit-000017.htm
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We are always more anxious to be distinguished for a talent which we do not possess, than to be praised for the fifteen which we do possess.
Mark Twain
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