-The American and European allergy expert committee guidelines recommend that solid foods be introduced between four to six months of age in all infants
-The most common food allergens in children in the United States and many other countries include cow's milk, egg, soy, wheat, peanut, tree nuts, and seafood (shellfish and fish).
Previous guidelines recommended delayed introduction of highly allergenic solid foods for the purpose of preventing allergic disease in high-risk infants.  More recent evidence suggests that this practice may increase rather than decrease the incidence of food allergies.
-The current recommendations are early introduction of highly allergenic solid foods in high-risk infants. These infants should be at least four months of age, be developmentally ready, and have tolerated a few less allergenic complementary foods, such as rice cereal and pureed fruits or vegetables.
-The one exception is liquid, whole cow’s milk, which should be avoided in all infants less than one year of age for reasons unrelated to allergy. Cow’s milk formula and other cow’s milk products such as those in baked goods, cheese, and yogurt do not need to be restricted prior to age one year.