I've just remembered a novel I read as a teenager that I found really upsetting. I can't for the life of me remember what it was called or who wrote it, and Google isn't helping.
I think a couple had been told that their baby was stillborn, but later discovered that it had been born with a severe and rare disability and abducted by a dodgy doctor and imprisoned in a secret facility for research/experiments. The couple eventually located the building, which held numerous profoundly disabled children who were subjected to horrific abuse. I seem to remember one of the children's condition involved them having no bones.
Does that ring any bells with anyone?