Many people have asked why I gave birth to a preemie. My family has a genetic malfunction. In spite of being sports minded, healthy and slender. We never smoked or did drugs and wouldn't even take caffeine whilst pregnant, we had premature births.
Our women folk have incompetent cervixes. It effects 50% percent of my family. We did not share our family information until it was too late for seven children in our family. The newest generation may escape the painful history. I pray they do. McDonald Cerclage saved many of my cousins, my niece and my nephews.

http://www.storknet.com/complications/incompetentcervix/exgs6.htm