Babies delivered via cesarean section were five times more likely to develop allergies by age 2 than those born vaginally when exposed to high levels of allergens, a study found. Gastrointestinal microbes may increase C-section babies' development of immunoglobulin E after allergen exposure, lead author Christine Cole Johnson said. The findings were presented at an American Academy of Allergy, Asthma and Immunology conference.

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