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Food allergies seem like a common occurrence, but they actually only affect 6 percent of children in the United States, according to BabyCenter. Many times, your child has a food intolerance that she will grow out of that is not a full-blown food allergy. Still, it's important to monitor your baby closely to look for the signs of food allergies. Delaying certain foods until your baby is a certain age may also help prevent allergies, both now and later in life.