Ultrasound is basically very high frequency sound waves. These sound waves are at a frequency well beyond the perception of the human ear and therefore no sound is actually audible.
Conventional or ‘standard’ ultrasound gives an image in two dimensions. 3D ultrasound, as the name suggests, gives a three-dimensional image. However, as is the convention, 3D describes a static image. With this technological development, you can see the baby in 3D and see the motion as well. It is the motion that is described as the fourth dimension hence the term 4D. In other words, you can see your baby in three dimensions and see all the action taking place in the womb.
The 3D baby scan can then be given any colour but in most cases is given a golden hue as it is regarded to be the most aesthetically pleasing.
Compared with the traditional 2D scanning the new 4D scanning technology gives you more insight into what is happening within the mother’s womb. With the 4D baby scans you are able to see the foetus in extraordinary lifelike detail, especially in the later stages of pregnancy when you can see the fetus behave in a similar manner to a newborn baby. With 3D and 4D baby scan technology you can see the fetus smile, yawn, suck on his or her fingers, scratch his or her nose and exhibit many other behaviours of a newborn baby.