What is a common symptom seen in children associated with depression?

In the context of childhood depression, social withdrawal is a common symptom that may manifest as a child becoming less engaged with peers and family, showing a decrease in interest in activities they previously enjoyed, or isolating themselves. This behavior can stem from feelings of sadness, hopelessness, or a lack of energy, which are typical characteristics of depression.

While whininess can be a behavior seen in some children, it is not specifically indicative of depression. Heightened alertness and excessive activity are more associated with other behavioral or psychological conditions, such as anxiety or hyperactivity, rather than depression. Therefore, social withdrawal is the most fitting answer, reflecting a key aspect of how depression may manifest in children.