It must have been something that happened during birth. The occupational therapy and physiotherapy will help a lot. In respect to his age, if his he can speak a few words now and his speech develops appropriately, and there are no other congenital problems, then his ability to learn is increased. His milestones will be delayed, not like other children, but with time and effort and prayers, he will get there.
There is a boy who works in IT, has signs of developmental delay. I saw him fix a laser printer in record time, and I was greatly impressed. That boy, despite his awkward movements and his affected speech, has skills in IT.
Don't give up hope. Give him all the care he needs. He'll turn out alright.
Set out to correct the world's wrongs and you will most certainly wind up adding to them.