I was confused about this too – I was thinking "what an earth can 4D be?!".
Basically the 4th dimension is time.
Someone had to explain it to me!
It's the difference between a still photograph and a video - so the 3D image is continuously updated providing a 'live action' view - this is 4D.
All my scans have been the regular 2D ones. I'm quite happy with this. Although I have had a 3D/4D place recommended to me ... I will think about it if I decide I want to see bubs again.


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