It is the responsibility of the parents to help them endure the burden they are born with. Also, predictions are sometimes false. I was born at 6 months, 1 pound, 4.5 ounces, and expected to either die or end up disabled. I don't even have to wear glasses, they were so wrong. I have siblings that are disabled and I can tell you, life finds a way to be lived. Robbed of things we would consider vital, but still, a valid life. With the things, I see every day I wish it was different, but I would never forfeit a life as you suggest.