After talks with the director of Kiran's preschool, who was similarly troubled by his behavior, and a round of medical Googling, Kiran's parents took him to see a child psychiatrist. In the winter of 2009, when Kiran was 5, his parents were told that he had preschool depression, sometimes referred to as "early-onset depression." He was entered into a research study at the Early Emotional Development Program at Washington University Medical School in St. Louis, which tracks the diagnosis of preschool depression and the treatment of children like Kiran. "It was painful," Elizabeth says, "but also a relief to have professionals confirm that, yes, he has had a depressive episode. It's real."
Is it really possible to diagnose such a grown-up affliction in such a young child? And is diagnosing clinical depression in a preschooler a good idea, or are children that young too immature, too changeable, too temperamental to be laden with such a momentous label? Preschool depression may be a legitimate ailment, one that could gain traction with parents in the way that attention deficit hyperactivity disorder (A.D.H.D.) and oppositional defiant disorder (O.D.D.) — afflictions few people heard of 30 years ago — have entered the what-to-worry-about lexicon. But when the rate of development among children varies so widely and burgeoning personalities are still in flux, how can we know at what point a child crosses the line from altogether unremarkable to somewhat different to clinically disordered? Just how early can depression begin?
The answer, according to recent research, seems to be earlier than expected.



