One of the toughest decisions facing pregnant women is whether or not to test their unborn child for Down's Syndrome. The test carries some risks - but a positive result can also confront the parents with a very difficult decision. Now a new, much simpler test is about to go to market - it's completely safe, and the results are more accurate than ever before. But that still doesn't resolve the moral minefield surrounding the issue. We met two couples with very different views.... and experiences.