I saw this documentary produced by the Phoenix Children's Hospital about Sean, a baby who was born 12 wks early, weighing under 3 lbs, and had all sorts of health problems, from a missing valve in his heart to a hole in his stomach. His doctors didn't think he would survive, but he did, and is now two years old. He's had a dozen surgeries and there is still a ways to go, but he is doing pretty well. It's amazing how far he's come.
If you'd like to take a look at the short documentary, it's at
http://youtube.com/watch?v=e6344MGxc2s