A nurse is preparing to measure the temperature of an infant. Which of the following actions should the nurse take?

A. Place the tip of the thermometer under the center of the infant's axilla: This is the correct method for taking an axillary temperature in infants, which is the recommended route due to safety and ease. The tip should be placed snugly in the center of the axilla and the infant's arm should be held firmly against their body to ensure accuracy. B. Pull the pinna of the infant's ear forward before inserting the probe: This technique is used for otoscopic or tympanic temperature readings in children under 3, but tympanic readings are not preferred in young infants due to the small size and curvature of their ear canals, which can lead to inaccuracy. C. Insert the oral thermometer in front of the infant's tongue: Oral temperature measurement is inappropriate for infants. They may not be able to keep the thermometer properly positioned, which increases the risk of inaccurate readings or injury. D. Insert the probe 3.8 cm (1.5 in) into the infant's rectum: Rectal temperature measurement is not routinely recommended unless specifically indicated, and the probe should only be inserted about 1.3 cm (0.5 in) for infants to avoid rectal perforation. The option listed suggests unsafe depth.