Food allergy: two common types as seen in breast and formula fed babies.

Cow's milk allergy can develop in both breast and formula fed babies. The allergy developing in breast fed babies is triggered by trace amounts of antigen, tends to cause severe reactions and may persist for several years. The allergy developing in formula fed babies is triggered by large amounts of antigen, is not associated with either positive prick tests or with anaphylactic reactions and often subsides spontaneously.