Baby's first picture is usually not a Kodak moment but a grainy black-and-white sonogram. Such images-generated with ultrasound technology that sends harmless sound waves into the mother's womb and measures what bounces back-usually tax the imagination of anxious parents trying to discern a foot, rump, or face. Images produced with new 3-D ultrasound technology, however, are a marked improvement. The system uses a monitor, computer controls, a processing unit, and a handheld transducer probe, which emits and collects sound waves, to render nose, lips, eyes, fingers, and toes in astonishing detail. It's as if someone photographed a clay model of the fetus.

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