Doctors check for behavior that’s:

• Not typical for the person’s age. (Most children can behave in those ways at some point or another, though.)
• Has a negative impact on the person’s ability to function at home, in social environments, or at work.
• They also have to consistently display at least six of the above symptoms:
  • For at least 6 months
  • And in at least two settings, such as at home and in school