A nurse is caring for an infant who has gastroenteritis. Which of the following assessment findings should the nurse report to the provider?

A. Sunken fontanels and dry mucous membranes indicate moderate to severe dehydration, a serious complication of gastroenteritis in infants. This requires prompt fluid replacement (oral or IV) to prevent hypovolemic shock. B. A mild fever and slightly elevated pulse are expected findings in gastroenteritis and not immediately concerning. C. Decreased appetite and irritability are common, mild symptoms of illness but not critical. D. A small fluid deficit (30 mL over 24 hours) is minimal in an infant and does not indicate severe dehydration.