3D ultrasounds are bounces waves off the fetus from various different angles, and produce a three-dimensional image of the fetus. This image shows depth and great detail.

While, a 4D ultrasound use the same technology as 3D, but shows movement, 4D takes three to four images per second, which complied together show movement.

Technically, 3D/4D are not better than 2D, they are just different but are very popular with expecting mothers who wants to have glimpse of their unborn baby.

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