I heard a TV news yesterday that

kids can grow out A.D.H.D. and Autism when they reach the age of 13. I didn't listion it carefully since I was very sick last night. What I remmeberred is that kids with ADHD and Autism may not need any medication since ADHD was mainly caused by slow growth of brain. Compare with normal kids, the ADHD kids have a smaller brain. But kids' brain can grow faster in later years and eventually every kid can be the same at 13 years old.

If it is true, it is a great news. I always think that american pediatrics have been paying too much attention on ADHD and Autism.