And in Nazi Germany Jews and other undesirables such as Gypsies and Slavs weren't considered actual humans, and experimentation leading to their deaths was considered good for the worthy humans who might benefit from it.
You can take your pro-death philosophy and try to stuff it into a rational consistent view of life, but the contortions you have to go through are pretty twisted.
Science (and those who don't have a pro-death agenda) knows that a few celled fertilized egg, if left in peace, will be born after 9 months as - guess what! A baby human. It will only NOT be born as a baby human if killed.
I don't want to extend or improve my temporary body at the expense of the lives of others, no matter how small, undesirable, or, in my eyes, unimportant.
I suppose you are pro-abortion as well. If you aren't pro-abortion, then your world view is might inconsistent and obviously requires more objective thought on your part.
But would you agree that it's the right of the parents concerned to make their own mind up whether or not to have this treatment if it proves effective?