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Paul Ehrlich, Allergy & Immunology, answeredMilk allergy can emerge in babies for a few reasons. While breast-feeding has had resurgence in the past thirty years, it doesn't necessarily protect the baby from allergies. A colicky baby may have sensitivity to something in the mother's diet -- usually cow's milk or eggs. And while you wouldn't feed a baby a bottle of cow's milk in the first months of life, the major infant formulas are derived from cow's milk and can precipitate allergic symptoms.