3D ultrasound is a medical imaging technique that uses sound waves to create a three-dimensional image of a developing fetus in the womb. Unlike traditional 2D ultrasounds, which produce flat, two-dimensional images, 3D ultrasounds create a more detailed and lifelike image of the baby.

During a 3D ultrasound, a transducer (a handheld device that emits sound waves) is placed on the mother's abdomen. The sound waves bounce off the baby and create a three-dimensional image of the fetus on a computer screen. This image can show the baby's facial features, limbs, and other details in much greater detail than a traditional 2D ultrasound.

3D ultrasounds are commonly used during pregnancy to assess the development of the fetus and to detect any abnormalities or potential health issues. They can also be used to determine the baby's gender and to create keepsake images and videos for parents to cherish.