What is a vital sign that differs significantly from adult norms in infants?

In infants, a normal heart rate significantly differs from adult norms due to their higher metabolic rate and physiological needs. A heart rate of 120-160 beats per minute is typical for infants, reflecting their need for a faster circulation to meet growth and developmental demands. This elevated heart rate is a critical indicator of their overall cardiovascular efficiency and is essential for maintaining adequate organ perfusion and oxygenation, which is vital during infancy when growth accelerates rapidly.

In contrast, systolic blood pressure in infants is typically much lower than in adults, often ranging from 60-80 mmHg at rest, and the normal systolic blood pressure values of 90-110 mmHg would be more consistent with older children and adults. Similarly, the normal respiratory rate of infants is commonly higher than adults, usually falling between 30-60 breaths per minute instead of the much lower adult range. Finally, the normal body temperature range in infants does align closer to adult norms, but it can be slightly higher or lower, usually ranging between 97°F and 100.4°F.

Thus, the correct answer emphasizes the understanding of how vital signs present differently in infants compared to adults, particularly highlighting the heart rate.