Here is information from the American Academy of Pediatrics about depression and what to do if your child seems depressed.
Depression is not the same thing as sadness or grief. When children experience a difficult event, such as the loss of a pet or family member or the divorce of their parents, they may feel deeply sad and not be able to feel happy even when doing the things they usually enjoy. It is normal for grief to last for a while and then lessen, over time.
However, depression is a disorder of mood that causes sadness and/or other symptoms to be more intense or last longer than usual after a difficult event.
Depression can also occur without a triggering event. Children may have depression if their symptoms, which may include sadness, occur every day for more than 2 weeks.
Two common types of depression are major depressive disorder and...