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Richard,
 
I would like to say that from what I have read on this post, in medical
journals, heard in seminars and by word of mouth that  a multivitamin
would be a good idea for you 2 and 1/2 year old. I understand that with
celiac's disease that one does not probably digest the B vitamins and is
therefore deficient on them.
 
However, I would also like to add that you pediatrician and/or general
practioner are always the best place to start for any such "medical
information".
 
D-Lynn