It is not unusual for children with ADD to be completely focused an absorbed by something that interests them. On the other hand, schools seem to be 'diagnosing' children at an alarming rate.
I am by no means stating that your son is ADD, however, please contact the Attention Deficit and Hyperactivity Support group of Southern Africa (ADHASA) at www.adhasa.co.za/ or (011) 888 7655 for an educational psychologist in your area; usually one who is experienced with ADD is better able to diagnose whether positively or negatively.
You can also ask your GP or consult www.medpages.co.za for an educational psychologist in your area.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
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