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Many doctors believe that kids with one allergy are more likely to develop others -- a theory called the allergic march. Think of it as a parade route. A baby starts with one allergy; marching through life, he's likely to develop others. This doesn't mean he definitely will, but the theory helps docs ID kids who are more prone. Your child could also go off-route and develop an allergy or asthma later, even after the five-year mark.
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