Advances in fetal surgery at UCSF's Fetal Treatment Center save twins in a dire situation. In many ways, having a baby is a lesson in expecting the unexpected. Anna Endter's lesson started when her doctor looked at the ultrasound screen and pointed to two heartbeats.

Michael Skinner made medical history in 1981. He was the first baby in the world to survive successful fetal surgery—an operation to repair a life-threatening condition while still in the womb. He was born on May 10, 1981, at UCSF Medical Center. It was Mother's Day.