Royal Phillips Electronics has come out with an amazing new ultrasound where prospective parents can experience the wonder of a view inside the womb! See here!
It doesn’t work much differently than a regular ultrasound, except that the technology reading the black and white images turns it into a 3-d image for you to better “see” your baby. Think old type Disney cartoons as the old black and white ultrasound, and then 3d/4d baby scan is like, Pixar. Just a bit cooler.
Why 4d and not just 3d? Are we really dealing with the 4th Dimension here? Of course not 
3-d will render a 3-d image, while 4-d will render a moving 3d image. You can see your baby yawn, squirm, make a face at the annoying ultrasound noise, or just sleep peacefully.
In an article from the Washington post:
Last year, Philips researchers began modeling ultrasound visits after a spa-like experience, complete with ambient lighting and new technologies intended to reduce stress. Images are streamed onto a big, bubble-like screen. With large, clearer images, Rettenbacher says, doctors may be able to “diagnose abnormalities a lot earlier than [they can] today
If you are gonna get just one, it makes more sense to wait a bit until your 26th-34th week. However, if you are going to do it multiple times, anytime during your second trimester would work
So how do you get one? From my cursory research, it seems like it is very popular in the UK, and of course not so popular yet in the United States (why are we always so technologically behind?) Just google 4d baby scan and your state and a bunch of clinics should pop up!
