In short, 4D ultrasound imaging is a 3D ultrasound in live motion. 4D ultrasounds utilize either a 2D transducer, which rapidly acquires 20-30 volumes or a matrix array, which instead uses a 3D ...

This way, the baby will be developed enough to see their features. Unlike a 2D scan, where you get a flat, grey image of your baby in the womb, a 4D scan creates a moving 3D image of the baby.

But are 3D/4D ultrasounds really worth the risk? Every expectant parent has a moment where it hits them. For Nicole and Benson Klemme, that moment was the first time they saw their baby.

With 3D and 4D ultrasounds parents can also get an idea of what a baby will look like. Now, ultrasound renderings are available that can turn scans into almost portrait like images.

4D scans show fetuses yawn in the womb Reuters, Thursday 22 Nov 2012 New technology shows that babies yawn inside the womb, but probably for different reasons!