It is a scene of miracle working repeated often enough in hospitals throughout the country. A tiny human being, weighing merely a pound, enters the world with premature haste. His lungs are too rudimentary to admit vital air, his kidneys too weak to cleanse blood. Neonatologists, nurses and technicians descend, stabilizing his heartbeat and temperature, blanketing him in plastic and whisking him off to the intensive-care unit.
On a nearby corridor, a very different scene unfolds. A woman who is six months pregnant undergoes an abortion. Her decision to end the pregnancy so late most likely involves some kind of tragedy:...