I can understand a family saying enough and only wanting comfort measures in some situations. To kill by abortion or speed up the dying, is wrong though. I saw a post below where someone was horrified of a child that lived in a comatose state for 18 months. Not all people view disability like this though. The short little lives can often make a difference for the good in someone else's life. I say, keep helping these babies as long as there is hope.
God needs to be the One who decides when the end of each human life will be. We, with our finite minds, cannot get up high enough to see the tapestry that God is creating with all of the threads of each human's life. We cannot see how the threads intertwine or what other threads are touched by the tiny thread of a premature baby. God sees all the threads and He is creating the picture. The other issue is that there is purpose in human suffering. We do not always see the purpose but again, we are looking at it from a finite perspective. The growth of humans happens through pain and suffering. God knows this and allows humans to suffer. Look at the amount of suffering Jesus had to endure to redeem us from our sin. Do we really think that we, as humans, should be spared from suffering?
Another point to consider is that the medical profession has made tremendous progress in treating these "severely premature" babies. The truth is that there are not any good predictors of which ones will live or die and which ones will be disabled and which ones will be perfectly "normal". Neonatologists have seen too many of these babies "beat the odds" and turn out just fine. The last point is that we need to see the financial "cost" of caring for these premature babies (and the elderly) in perspective. In the US last year, we as a population, spent 3 times as much on soda as it cost to care for these babies ($20 billion on the babies, >$60 billion on soda). When we look at the financial cost we need to look at the priorities we place on how we spend our resources. I don't think people really believe that the care of premature babies is less important than soda. But when we discuss the financial impact of the health care decisions we make, we need to look at how much money we are spending on other things in our world and ask ourselves what our priorities for our resources really are.