Thanks for choosing health care magic for posting your query.
From the description that you have given it appears that he is having some kind of neurological movement disorder
. There are various movement disorders that are possible for his age. You need to show it to a pediatric neurologist
He will need an EEG and an MRI
brain. If everything comes out normal, then there is a possibility that the psychological causes may cause these twitches.
Then in that case a psychiatric consultation will be useful.
A child with psychiatric illness can look as a very healthy child.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.