Why not?
I'm for it with the right justification, esp. when people want it, my question now is it wrong to terminate, say, a three year old who is in IMMENSE pain but has the chance to live a long life yet one full of harsh physical suffering and low mental development? Why would it be wrong if so?
I think it would be up to the parents, but personally I am against euthanasia. Once people start judging when others can live and die, lines become blurred, and it may be that someday this judgment power of euthanasia falls into the wrong hands.