 [ Symptoms ] what are the most common food allergies in children [ Disease ] of the 6 to 8 of children below school age who have a food allergy the majority are allergic to eggs milk andor peanuts milk allergies affect about 2 5 of children egg allergies affect 1 5 and peanut allergies about 1 other food allergies that become more common as kids reach school age are allergies to wheat and soy shellfish fish and tree nuts