A nurse is caring for an infant who is admitted to the hospital for dehydrated and requires IV therapy. The nurse should monitor the infant's response to therapy by performing which of the following actions?

A. Head circumference measurement is important for monitoring growth and intracranial pressure, not acute hydration status. B. Taking vital signs every 2 hours allows the nurse to closely monitor the infant’s cardiovascular status, perfusion, and response to IV fluid therapy, which are key indicators of hydration improvement. C. The Moro reflex assesses neurologic function in infants and does not indicate fluid status. D. Daily weights are useful for monitoring fluid balance over time but are less responsive than frequent vital signs for acute changes in hydration.