I would go back 23 years to when I was pregnant with my firstborn and do whatever it was that may or may not have caused his disability differently.
To my knowledge I did everything by the book, but there must have been one little thing that I could have done or not done that I wasn't aware of that might have changed the whole outcome for him and given him a normal life.
It breaks my heart to think that he has never spoken a word in his life.
I'd give anything to sit and have a chat with him.