A nurse is teaching the parent of an infant about the manifestations of food allergies. The nurse should identify which of the following findings as a common manifestation of a food allergy?

A. Vomiting: Gastrointestinal symptoms such as vomiting are a common manifestation of food allergies in infants. Exposure to allergenic foods can trigger an immune response in the gut, leading to nausea, vomiting, diarrhea, or abdominal discomfort, making this a typical early sign. B. Dry mouth: Dry mouth is not associated with food allergies. It is more commonly related to dehydration, medication side effects, or other systemic conditions, and does not indicate an allergic response in infants. C. Decreased respiratory rate: Food allergies typically cause respiratory symptoms such as wheezing, coughing, or difficulty breathing, rather than a slowed respiratory rate. A decreased rate is not characteristic of an allergic reaction. D. Hypertension: Food allergies do not usually cause elevated blood pressure. Severe allergic reactions can lead to hypotension in cases of anaphylaxis, not hypertension, making this an inappropriate indicator.