4D Scans are performed any time from 12 weeks. The timing depends on what stage of development the parents would like to view their baby. Early pregnancy scans demonstrates full body foetal views with detailed bony anatomy and movement.
As the pregnancy progresses, images will display separate views of the face, legs, arms, gender etc. The layers of muscle and fatty tissue increases in thickness and facial character becomes more evident. Babies are often seen yawning, blinking, waving and swallowing. 3rd Trimester 4D Scans display a striking resemblance to the baby at birth.
Earlier scans have a better chance of good images so best to start earlier and follow up at later stages in 4D.
The best images are obtained when there is sufficient fluid and no obscuring structures causing image distortion. If the baby chooses to hide, many techniques will be performed to try and change position. Unfortunately baby’s performance is unpredictable and unavoidable so images can never be guaranteed.