What is the main source of depression in children?

The main source of depression in children can vary from child to child depending on the circumstances and conditions.  Several causes have been closely associated with genetics and environmental factors.  There are also biological, social and psychological factors that can contribute to depression in children either separately or combined. For example, two children can be raised in the exact same environment with the same resources available to them and one may become depressed while the other one does not. Some of the most common factors linked to depression in children are as follows:

1. family history of depression
2. parents’ divorce
3. excessive stress
4. abuse or neglect
5. trauma (physical and/or emotional)
6. loss of a parent, caregiver or other loved one
7. loss of a relationship, such as moving away or loss of boyfriend/girlfriend
8. failure to accomplish tasks such as learning to read, or keeping up with peers in other activities
9. chronic illnesses, such as diabetes
10. other psychiatric disorders
11. other developmental, learning or conduct disorders

Source:
"Major Depression - Causes, Symptoms, & FAQ." Boston Children's Hospital. Web. 12 Sept. 2013. <http://www.childrenshospital.org/az/Site1268