Useless at birth is when it is known that they will never speak, feed themselves, run, walk, or crawl.
should be up to the family and with proper
my brother has 4 children. on the 1st, the ultrasound showed an anomaly that they geneticists shad associated with a genetic defect. they were counseled to abort. they said no. the geneticist was so angry, that she wouldn't talk to them anymore. the baby was fine. send pregnancy, same story. referred to the same geneticist...who remembered them and ask them if they would consider an abortion. they said no. she refused to talk to them again.
same thing with the 3rd and they didn't bother following up on the referral to the geneticist. on the 4th, the anomaly was spotted, but the tech said not to worry. seems in the intervening years they had determined that this was a common thing and only very rarely was there a problem with the child. better technology had allowed them to see more often something that was common.
had they followed the advice of the geneticist, two of their very lovely and quite brilliant children would not have been born.
i think i wrote here long ago about why i have developed the views i now have on abortion, so i won't do it again. suffice it to say that the farther medicine comes, the more i, and many, believe that we are taking a life with the procedure.