I'm even more tender toward children. If you haven't seen them, the new sonograms are amazing.
A 3D ultrasound uses the same basic concept of a 2D ultrasound, technology-wise, but rather than take the image from a single angle, the sonographer takes a "volume" image. The volume image that is displayed on the screen is a software rendering of all of the detected soft-tissue - meaning your baby's face, hands, feet, or whatever the sonographer happens to be focusing on. A 3D ultrasound produces a still image.
A 4D ultrasound (also referred to as "Live 3D") extends on the concept of a 3D ultrasound, but rather than taking a single volume image, multiple volume images are taken in rapid succession. The result of these images displayed in succession is a motion video of the baby. You can see movement, such as arm or feet movement, thumb sucking, and even smiling.
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