A nurse is assessing a 3-month-old infant whose parents report starting cow's milk feedings 1 week ago. Which of the following actions should the nurse take?

A. Advise the parent to avoid giving cow’s milk to the infant prior to 1 year of age: Cow’s milk should not be introduced before 12 months due to the risk of iron-deficiency anemia, gastrointestinal irritation, and inadequate nutrient composition. B. Instruct the parent to give the infant water every 3 hr between feedings: Water is not routinely needed in infants under 6 months; breast milk or formula provides adequate hydration. C. Recommend the parent mix the milk with rice cereal for feedings: Mixing cereal with cow’s milk does not make it appropriate for infants and increases the risk of nutrient imbalance. D. Instruct the parent to give 5 mcg of vitamin D daily: Vitamin D supplementation is appropriate for breastfed infants, but this does not address the concern about cow’s milk.