a traditional abortion can not be done after about 18 weeks because the skull is formed. Either the skull has to be crushed and sucked out, or the child has to be born. I'm saying that killing the child as it is being born, is not the best way to birth these babies regaurdless of weather they are viable or not. If the skull is big enough to be partial born so that the fluid can be drained, then why can't the child be born and allowed to die with dignity? Maybe I'm missing something here, but I think there are other options, this is just the one of choice because it produces a dead baby and no one has to deal with an imperfect baby that just might live.
As I said before, I know a family who had doctors tell them that their unborn son had no brain and should be aborted, he was born early by cesarian section and is now 2 years old! He isn't "perfect" but he certianly does feel pain and joy and is living a full life.
I also know a family with a similar story and their little girl is just over a year. She is slow, but making progress, and bringing joy to her family.
I'm not sure that a child with an incomplete brain does not feel pain. If there are nerve endings then the ability to feel pain is very possible. In the case of my friend's chidren, the doctors were wrong about how much brain was there, and had the parents listened to the doctors, those babies would have felt pain as they were killed during birth!