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

A. Counting the number of wet diapers every shift: While useful, daily weight provides a more precise measure of fluid balance. B. Taking the infant's vital signs every 2 hr: Vital signs alone do not provide as direct a measure of fluid balance as daily weight. C. Measuring the infant's head circumference twice per day: Head circumference is unrelated to hydration status. D. Weighing the infant at the same time every day: Daily weight is the most accurate indicator of fluid status in infants.