When can this scan be done:
25 – 27 weeks
4D scans can be done at any time, however 25 – 26 weeks have been found to be the most opportune time to do a 4D scan. It is a time when the baby is not too big yet and there is still ample amniotic fluid. When the baby becomes too big and the amniotic fluid less the baby pushes up against the walls of the womb and cannot be visualised properly.
The aims of the scan:
The aim of the scan are the same as with a growth scan, but with the majority of time spent making pretty pictures and clips of the movement in 3D and 4D.