As far as I know, there is NOT an established connection between early or precocious puberty and ADHD. However, there is a great deal of research to link early puberty with different kinds of behavioral and emotional problems. That is, many children who experience pubertal development earlier than their peers are more likely to experiment with drinking and substance use, exhibit higher rates of depression, anxiety, and acting out behavior.

That said, you are still dealing with the reality of a seven-year-old demonstrating signs of precocious puberty and ADHD. Some research shows that a combination of medication and nonpharmacological treatments (behavioral) is most effective for managing ADHD symptoms, but there is certainly evidence that behavioral methods on their own can be almost as efficacious.

You should consider working with the clinician who diagnosed your son to develop a behavior modification or management program to help your son manage his symptoms of impulsivity and hyperactivity. Identify specific behaviors that you would like to change and reward him each time he exhibits the positive behavior you wish to have. Many parents use charts or calendars with stickers to document their progress.

In addition, it is often useful to have a structured and consistent schedule for children with ADHD. That is, meals should be at the same time each day. What happens before and after meals should also remain consistent. When changes are coming, your son should be provided with several warnings before the transition.

Finally, you should schedule time with your son to engage in positive, free-play time. Spend twenty minutes several times of week playing with your son in an activity of his choosing. This is a time where there is no judgment or critique. Just play and be in the moment with your son. Research shows this time is very beneficial for building the parent-child relationship that can often get splintered because of the constant complaining and cajoling that occurs with the misbehavior of ADHD children. For more on this, you should take a look at the book by Russell Barkley, "Taking Charge of ADHD: The Complete, Authoritative Guide for Parents."

Also, for more on ADHD, see the following section of this website:
http://www.education.com/reference/topic/SpecialNeeds_ADHD/

Good luck!

L. Compian, Ph.D.
Education.com Team