Hello and thanks for writing in at HCM
Our heart beats about one lac times in a day and about 1% abnormal heart beat
are accepted to be normal. But if these are more than that than it would be a matter of concern. The holter study of your son can clear much of the queries.
If your child have some problem with these abnormal heart beat like he feels vertigo
or weakness or some other kind of physical or mental problems than you should your consult your cardiologist soon.
Without seeing EKG nothing can be said that what changes are present. You can scan and send EKG at HCM for more detailed answer.