What is a key sign of dehydration in a child?

Dry mucous membranes are a classic sign of dehydration in children. When a child is dehydrated, their body loses more water than it takes in, leading to a decrease in moisture in bodily tissues. This lack of hydration becomes noticeable in areas such as the mouth and throat, resulting in dry mucous membranes.

In children, this can also manifest as a dry tongue or cracked lips, indicating insufficient fluid intake. These signs are particularly important to identify as dehydration can lead to more severe complications if not addressed promptly. Maintaining adequate hydration is vital for a child's overall health, and recognizing early signs like dry mucous membranes helps caregivers take necessary action to replenish fluids.

The other options do not accurately reflect indications of dehydration. Increased energy levels would typically suggest good hydration, while frequent urination might indicate normal fluid intake rather than dehydration. Consistent weight gain is generally a sign of well-being rather than a lack of hydration.