Presumably 20.
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Sonogram
The answer is a sonogram
time.A 4D ultrasound is simply a 3D ultrasound that gets updated very rapidly making it look more like a live ultrasound than a static picture. The fourth dimension is time.
XX=20
XX = 20
The risks of having a pregnancy ultrasound are minimal compared to the benefits. The ultrasound is not an invasive procedure, but can provide a good picture of how the baby is developing.
an ultrasound
XX means twenty.
XX is the Roman numeral for 20
20