The answer is no. We do recommend drinking plenty of fluids (preferably water) for a few days prior to your 3D sonogram. This has nothing to do with a full bladder. Drinking fluids increases amniotic fluid. Amniotic fluid is needed to get CLEAR face shots of your baby.
So drink plenty, but don't keep a full bladder!
If you're wondering why do you have to have a full bladder for your regular sonogram:
A full bladder is needed to see and measure the cervix properly. This is to make sure that there is no cervical incompetancy. After 18-20 weeks it is not neccessary to have a full bladder as the cervix is more visible.
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