The preemies grow up.

The patients are tiny; their medical problems can be immense. For the infant born with heart or lung disease, life begins as an all-or-nothing struggle--a struggle that, until recently, the infant usually lost. No longer. Today, thanks largely to pioneering work done at the University of California, San Francisco, sick newborns who surely would have died a few years ago are being saved and are growing up to lead healthier lives than was ever thought possible.