An ultrasound scan involves sonographic waves being directed into the uterus, the waves bounce off the fetus and internal organs to reflect as images on the screen. These images can be represented by 2, 3 and 4 dimensionally. In most cases, the 3D and 4D imaging is not really a necessity but a choice the parents make to get a clearer visual of their baby.
Here is the Ultimate Pregnancy Scan Guide by Channel Mum:
The video showed fruits and vegetables in comparison to the size of the fetus as it develops in the womb and it’s pretty incredible. The video also features the stages of the growing fetus in the womb as a reference.