If you want to get your baby to move during a gender or 3D ultrasound, eat fruits that are high in sugar about 30 minutes to an hour before your ultrasound appointment. It's possible that the baby could be sleeping if you have not been tracking his/her sleeping patterns. The natural Fructose found in fruit can wake up your baby and get them moving when it's time for their close-up!
Around one or two weeks prior to your 3D 4D Ultrasound appointment, it's best to drink more water than you might normally drink. With all that pressure on the bladder, you might think drinking more water is a recipe for more trips to the restroom. Honestly, it probably is, but you can see a vast difference in the quality of the 3D ultrasound images when the mother is drinking plenty of water. It's a stark difference - the amniotic fluid is much more clear than those mothers who may not be drinking as much water.