A common sign of severe dehydration in children is:

A sunken appearance of the eyes is a notable sign of severe dehydration in children. When a child is significantly dehydrated, the body loses a substantial amount of fluid, which can lead to various physiological changes. The tissue surrounding the eyes may lose hydration, causing them to appear sunken or hollow. This symptom can often be accompanied by other signs of dehydration, such as dry mouth, reduced skin elasticity, and lethargy.

In contrast, choices like increased energy levels, heightened sense of thirst, and frequent urination are not typical indicators of severe dehydration in children. In fact, during severe dehydration, children may exhibit decreased energy levels rather than increased. While a heightened sense of thirst may be present, it does not specifically indicate severe dehydration, as it can be a more general response to any degree of fluid loss. Frequent urination is also not characteristic of severe dehydration; in fact, dehydration typically leads to reduced urine output. Therefore, the sunken appearance of the eyes serves as a more definitive sign of severe dehydration in children.