by 
The Curious Bag
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<h4 class="dechead">On One Hand: Anytime Between 24 and 32 Weeks Is Recommended
The 4-D ultrasound technology will be able to produce the best fetal image between 24 and 32 weeks. Anytime within that period is optimal for a single fetus. If you are carrying twins, the ideal fetal age is 22 to 26 weeks due to baby size and position.
On the Other: 4-D Ultrasounds Can Be Done Earlier
Clear and detailed images have been seen on 4-D ultrasound monitors as early as 18 weeks. Many factors can change the quality of your image, like fetal position, size and age. If the position and size of the fetus are ideal, early images can be as good as images taken later in your pregnancy.
Bottom Line
The gestational age of the fetus plays a role in the quality outcome of images created by a 4-D ultrasound. While the ideal fetal age is between 24 and 32 weeks, it is possible that an image can be of good quality as early as 18 weeks.
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