Although this topic of discussion is very taboo in some circles of sociality, nevertheless it’s very important to understand ones stand and circumstances, as a religious person one may reject such a notion or practice, from a parent point of view and from the society at large, what good does it do to keep the poor thing alive medically? Argument is, if God all mighty has powers not to permit such births, why does he? And if it is being born why not care and show compassion to the unfortunate soul, maybe it’s a test or just an accident?
But one thing is for sure you can go on a lifetime debating what’s right or wrong, meanwhile the only parties suffering will be parents and the child.
As a parent, I would not hesitate to put my child to sleep if he/she has no hope of surviving, that’s the most human thing to do, at list there will be only one party suffering for the rest of his life instead of two.