What is a common sign of dehydration in infants?

Dry skin is a common sign of dehydration in infants because when the body lacks sufficient fluids, it prioritizes hydration for vital organs over less critical areas like the skin. As a result, the skin can become less elastic and appear dry or flaky. Infants have a higher body surface area relative to their volume, making them particularly susceptible to dehydration. Consequently, signs of dehydration such as dry skin can manifest relatively quickly in infants compared to older children or adults.

In contrast, rapid weight gain is not associated with dehydration; it would actually indicate an increase in body fluids or fat. Full fontanelles indicate that an infant is well-hydrated, as depressed fontanelles are more indicative of dehydration. An increased appetite is also not a sign of dehydration, as the opposite is often true; infants may show decreased interest in feeding if they are dehydrated. Understanding these signs is crucial for early identification and management of dehydration in pediatric patients.