What is the normal rectal temperature range for infants?

The normal rectal temperature range for infants is indeed from 97.9°F to 100.4°F. This range is established based on physiological norms for infants, who typically have higher core body temperatures than older children and adults. Rectal temperature is considered one of the most accurate methods for measuring an infant's core temperature because it reflects the internal body temperature more closely than other methods, especially when infants are in a critical or unstable state.

In this range, 97.9°F is considered the lower threshold of normal, while 100.4°F is the upper threshold. A temperature of 100.4°F or higher is generally considered a fever in infants, which can indicate the presence of illness or infection, requiring appropriate assessment and intervention.

Keeping this in mind, the other choices either fall below the established normal range or extend beyond it, making them incorrect. It is crucial for caregivers and health professionals to monitor rectal temperatures to ensure any abnormalities are addressed promptly for the health and safety of the infant.