A child psychiatrist treats children who have psychological disorders. A child psychiatrist, also called a pediatric psychiatrist, diagnoses disorders in children, such as autism and ADHD. Following the diagnosis, the child psychiatrist develops a treatment plan, which may include medication and counseling. In addition to drawing from the teachings of medical school and pediatric training programs, child psychiatrists use their knowledge of child development, applied behavioral analysis (ABA), and child advocacy to treat children.