Which of the following is NOT a sign of poor perfusion in a child or infant?

In the context of assessing a child's or infant's physiological status, increased activity level is indeed not a sign of poor perfusion. In fact, a child or infant who is experiencing adequate perfusion typically exhibits normal levels of activity because their body is receiving sufficient oxygen and nutrients through effectively functioning blood circulation.

In contrast, signs of poor perfusion include cool, moist skin, which indicates reduced blood flow and can occur in response to a decline in cardiovascular performance. Pallor, mottling, or cyanosis are critical visual cues indicating inadequate oxygenation and can signal serious health issues requiring immediate attention. Similarly, a weak or thready pulse is a definitive indication that the heart is unable to pump blood effectively, further demonstrating compromised perfusion.

In summary, while the other signs point towards inadequate blood circulation and oxygen delivery, increased activity level generally reflects a stable condition where perfusion is satisfactory.