This is something you see in younger babies who are developing balance. But he seems a little old for that. Let us know what your doctor says. We are all interested.
I would definitely contact your Doctor and then the Doctor will help you find a Neurologist, from there, tell the Neurologist the symptoms of your baby boy, and then the Neurologist should give your baby the EEG test... which will test your baby if the baby has Epilepsy.