Breastfed babies are provided with protection from developing allergies during the breastfeeding period and well into the future for two major reasons, says Ann Russell, IBCLC, of Poway, Calif. "[Breastfed] babies are exposed to fewer allergens in the first months of life, and secondly, the first feedings of colostrum literally 'seal the gut' (the porous lining of the intestines), providing a barrier to the absorption of allergy-producing agents."

Additionally, both colostrum and Mother's mature milk are rich in antibodies, providing a baby with the benefit of the mother's immune system until the baby develops his own functional immune system at about 6 months of age.

The earlier and more often food is ingested, the greater the likelihood for food to become an allergen, says Russell. Cow's milk tops the list of food allergens. "There are more than 20 substances in cow's milk that have been shown to be human allergens," she says.

Baby formulas are derived from cow's milk. While soy formulas are available for babies with allergic reactions to milk products, Russell points out that these babies suffer a great deal along the way to finding the right formula. Allergic reactions in babies range from spitting up, diarrhea and colic to congestion, ear infections and sleeplessness.

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