Diagnosing Borderline Personality Disorder (BPD) in young people has long been a tough call for clinicians, either for fear of stigmatizing the child or confusing the normal mood shifts of adolescence with pathology. Now, a recent upsurge in relevant research into early-onset BPD is inspiring the field to move beyond this hesitance toward a developmentally nuanced understanding of the disorder. The Handbook of Borderline Personality...