I believe we have a responsibility that goes with advancing medical knowledge and improvements in neonatal care. If we make sufficient progress that babies can be born very early and be kept alive with technology and sophisticated medicines, we have a responsibility to those babies to protect them, too. Aggressive treatment causes suffering, too.
Babies who have no quality of life, are suffering unbearable pain, and are not going to get better, should be allowed to leave this life with dignity, using the same good palliative care that terminally ill people should be given. Above all, though, they should be protected, not left to the judgement of whether being disabled or unwanted negates their potential.
I hope this public debate triggers some thinking in people who can't be bothered to use contraception. Abortions can be reduced, pregnancy in teens is going down at last, and early antenatal testing can help to reduce the need for late abortions.
To decide that an infant can be killed, after all else has failed to reduce and prevent the need for such action, does not make it ethical or a sound argument.