Most doctors recommend maintaining a healthy fluid intake, especially while you are pregnant. This will help to ensure your amniotic fluid is clear as well as full. There are many things out of the sonographer’s control like the baby’s position, the mother’s skin type and build, amount of amniotic fluid, etc. Drink plenty of water even several days before your appointment to ensure your amniotic fluid is clear. About a half hour before your 3D/4D ultrasound scan, try to drink cold water or a fruit juice so that your baby will be awake during your session (unless you are told not to by your physician).