A follow up thought after I read the thread on euthanasia. And I know this will be a very touchy subject.

Suppose a child is born with severe mental retardation, to the extent that he will always be wheelchair bound, not be able to make conversation or look after himself. In your opinion do you think that his life has innate worth? If a mother euthanised her son in this situation, would you condemn her? He will never contribute to society, he will never start a family and procreate. He would not miss his life, he neither wants to live nor wants to die.

I'm curious to see what others think.