2D ultrasounds are part of routine prenatal care. What about 3D and 4D ultrasound technology ... during the second trimester ...

And since 3D ultrasounds and 4D sonograms allow you to see your unborn ... expecting women have at least one 2D ultrasound ...

but do not take the place of ultrasounds at a doctor's office. To get the best images, drink lots of water and schedule an appointment between 27 and 34 weeks. 4D HD packages start at around $100.