Much as I abhor the idea of aborting an abnormal foetus, I would say that going for an abortion is the best way out.
I have seen how badly an abnormal child effects a relationship. If the abnormality happens after the birth, then we can do nothing. However we can help when it's just a sac of egg.
I have seen an abnormal man die on streets after both his parents died because there was no one to take care of him, and nobody to pay for his medical treatments which he needed to survive. He became a menace and kids were terrified of him as he tended to hit anyone who came near him. It was such a sad situation. He did not have any idea how to deal with anything. His only sister could not look after him as her in laws obviously had no sympathy for him. The neighbours did try to help for a while, but it was of little use.
This happened a long time ago, when I myself was a kid, and it was then I had understood how cruel it is to subject a child to the harsh realities of this life when it is not fully equiped to deal with it.