K.H.
My doctor told me once my daughter hit 1 that she could eat everything no except shellfish and nuts. I think she recommended 2 for those foods. If you really want to start early, I know a couple who gave peanut butter to their kid for the first time in the parking lot of the emergency room! Sounds silly, but it gave them peace of mind. Apparently, if a person has an allergic reaction to a food, the reaction is fairly immediate.