I have a friend who has a severely allergic child.  He nearly died at 6 months
of age when other foods first offered.  Now at 4+ years, he still nurses lots
and can tollerate some foods and mom has been able to expand her diet a little.

This mom suggests these books: (I have not read either)

IS THIS YOUR CHILD? by Doris Rapp and THE WHOLE WAY TO ALLERGY PREVENTION AND
RELIEF by Jacklyn Chron.

Ruth Sweet of Verona WI