Early intervention from speech-language therapists, occupational therapists, and physical therapists, can be very, very helpful. Are these available where you live? A good place to find out would be by talking with a doctor or nurse.
I think you are doing the right thing by questioning whether his development is everything it could be.
Reading between the lines of your post, it sounds like there is a special school available where you live. That is good news, because if your baby has any significant delays, a special school could be very helpful.
The baby of a friend of mine started early intervention at approximately your baby's age. When he started, he had significant delays. Now, if you were just meeting him for the first time (age 4), you wouldn't guess he had extra challenges in the beginning.