It's one of the most beautiful bonding experiences during pregnancy. Why Timing Matters The clearest 4D images depend on four things: Baby's size Baby's position The amount of fluid around the baby Mums body composition These change week by week — which is why certain windows give the best results. Week-by-Week Guide to the Best 4D Scan.. 3D & 5D ultrasound images and 4D ultrasound video can be obtained at any stage. However, we do recommend a gestational age of 26-34 weeks for the best facial detail. At this stage, the baby has put on some weight and filled out to make features more visible, yet still enough fluid in front of baby's face to obtain great images."
You can book a 4D scan anytime between 24 and 34 weeks, but the ideal window is between 26 and 30 weeks, with 27 to 28 weeks often giving the clearest, cutest images.. When Is the Best Time to Get a 3D or 4D Scan? The ideal time for a 3D or 4D scan is between 24-26 of pregnancy. Before 24 weeks, the baby may not have enough fat under the skin, making features less defined. After 32 weeks, the baby might be too big, making it harder to get a clear image.