My wife miscarried 18 years ago between our two daughters. At the time she was around 16 weeks along. It was a very traumatic thing for both of us, especially the DNC. But the physician told us the baby was lost because it was not able to carry on. The most important thing to do is reassure the parents that the miscarriage was not their fault. It was just the way things happened. It will make the next child just that more special. A strong Faith in God's Will helps a lot.
Thank You!