The 2D (2 dimensional) image is the flat black and white picture that looks like an outline or skeletal image of your baby you get at your diagnostic ultrasound. The 3D (3 dimensional) image will look more realistic, like a detail photograph of your baby. The 4D (4 dimensional) actually uses the amazing 3D technology to view your baby in "live motion" like a video. 4D is when you get to see movements, such as kicking, waving, sucking their thumb, or even smiling. A picture is worth a thousand words, please refer to the HOME page for a quick visual comparison.