Welcome to HCM.
You haven't mentioned the age of your son. If he is a child then the CD4 count is not the matter but the percentage of CD4 only is important as the CD4 count in children always will be more in Children than adults.
itself will not cause any disease in most of the occasions. In course of time it destroy the CD4 White cells and the immunity of the individual against infections getting decreased to the maximum extent then only HIV disease produce manifestations. By this time and with the CD4 count the disease is classified as stage II,III,IV .
There is no proved treatment modalities for HIV other than modern medicine. You can postpone the the treatment with ART by good nutrition, exercise and hygienic life style modifications which will be taught by your counselor or your physician.
I wish your son a very comfortable and a healthy life.