Final answer:
Newborn infants with a heart rate less than 60 beats per minute and signs of poor perfusion may require immediate medical attention.
Step-by-step explanation:
The subject of the question is Health.
In the context of newborn infants, a heart rate of less than 60 beats per minute with signs of poor perfusion can indicate a medical emergency. This is evaluated using the Apgar score, which assesses five criteria including heart rate, respiration, skin color, reflex, and muscle tone. A low Apgar score suggests that the baby may require immediate medical attention.