Girls are often diagnosed later than boys because they show symptoms in less obvious ways, such as being inattentive. Bright children may not be diagnosed until later as they may compensate for their difficulties until schoolwork gets more challenging. ADHD symptoms must be present for at least six months before a child can be diagnosed with ADHD, and symptoms should be present before age 12, notes the AACAP.

Most guidelines recommend behaviour therapy for pre-schoolers with ADHD and medication only when needed.

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