Keep in mind that 3D and 4D ultrasounds are not typically used to diagnose problems with your baby. Also, getting an ultrasound at a commercial center is not a substitute for medical care.

which happens between weeks 18 and 22 of your pregnancy. The typical ultrasound creates a two-dimensional cross-sectional image of your baby. Some facilities advertise 3D and even 4D ultrasounds ...

What about 3D and 4D ultrasound ... second trimester between 18 and 22 weeks. Also known as a level II ultrasound, this test is used to check in on how your baby and placenta is developing.