I'll be honest I am really torn on this one.
I would absolutely not terminate a pregnancy for downs or any other disability that could be detected in utero that was not incompatible with life.
But I think that incompatible with life is different. If it is absolutely certain that a baby will die within minutes of birth then in reality the only reason a mother is going through a pregnancy is for their benefit.
Is it right to go through a pregnancy, allow the baby to develop, put it through the trauma of childbirth (because childbirth is traumatic for the baby), only for it to die what could potentially be a painful death?
I'm not talking weeks or months or a limited life of a few years here - I am talking minutes or hours. That baby is not going to have a wonderful life for those few minutes in which it is alive.
And I personally think that keeping a baby until birth just so you can hold it while it dies is wrong and selfish.
I think the baby should come first, and I think that in a case where certain death can be detected early on then the humane thing to do is to terminate the pregnancy while the baby is still unable to feel pain.
Obviously that is just my opinion, but I personally could not put my child through birth only so I could have the experience of watching him/her die. sorry.