A new pre-natal screening program in Denmark has halved the number of babies with Down's Syndrome.

The success of the program, undeniably a form of eugenics, raises a number of questions about how far people should go with pre-natal screening - and what kinds of conditions merit termination of a pregnancy

Many people, including the infamous bio-ethicist Peter Singer, would argue that there's a social benefit to knowing whether you're going to have a Down's Syndrome baby.

The child will need lifelong care and supervision, which could be a drain on family (and the state)

The Denmark program's main innovation was early, non-invasive testing for Down's Syndrome

If a pregnancy showed several symptoms of producing a Down's baby, the doctors would suggest a more invasive test that could determine beyond a doubt whether the baby would be born with the condition