We are so sorry to tell you that your new born son has a disease known as Amyotrophic Lateral Sclerosis (ALS), more commonly known as Lou Gehrig's disease. As ALS progresses, the degeneration of motor neurons in the brain interfere with messages to muscles in the body which means that your son will be totally paralysed, unable to talk, not even able to control his body functions. Far better that we just let your son slip away, leave you to mourn and grieve, then, when you feel able to, perhaps try for another baby.
That is what can happen once the genie is out of the bottle, and if that unfortunate child not been allowed to live the world would have been robbed of the genius of the physicist Professor, Dr, Stephen Hawking.
The problem with Euthanasia is that once a law is passed, legalising assisted dying, it won't be restricted to the terminally ill. Anyone seen as a financial drain could be coerced, especially confused elderly people. I sincerely hope we don't let that genie out of it's bottle.