What finding should a nurse report for a 10-hour-old newborn?

In the context of a 10-hour-old newborn, the heart rate of 158 beats per minute falls on the higher end of the normal range but is still within acceptable limits for newborns, which typically ranges from 120 to 160 beats per minute. This finding would not warrant reporting as a potential concern.

The axillary temperature at 36.5° C (97.7° F) is also within an acceptable range for a newborn, although the ideal range is generally around 36.5 to 37.5° C (97.7 to 99.5° F).

Having one void since birth is a reassuring indication that the newborn's kidneys are functioning appropriately and that hydration is adequate, especially in the first 24 hours of life.

The presence of nasal flaring is significant because it can indicate respiratory distress in newborns. This is a concerning sign, as it might suggest that the infant is struggling to breathe properly, which requires further evaluation and potential intervention. Such a finding is critical and should be promptly reported.

Thus, the correct answer highlights a vital sign that may indicate the need for urgent attention, emphasizing the importance of monitoring respiratory status in newborn care.