If you are pregnant and haven't had an ultrasound, you're probably wondering, "When will mine be?" If you've already had one, you probably can't wait for the next. Why are ultrasounds so exciting? After all, most people will tell you that your unborn child is pretty much unrecognizable.

But it's magic, nonetheless. You hear a heartbeat. You see movement, and if you are lucky, you recognize fingers, a hand or even a tiny nose. It's your baby's first photo session and with answers to your questions and concerns, you'll enjoy it even more.

"The term ultrasound refers to high frequency sound waves far beyond the range of human hearing," says Nikki Nazeri, a registered diagnostic medical sonographer in Los Angeles, Calif., and the author of Your Baby's Ultrasound for the Sex and Beyond.

During the ultrasound, the ultrasonic probe passes over the mother's abdomen. Inside the probe there is vibration, and sound waves are produced. Those sound waves pass through the mother's abdomen and into the baby's body where they encounter different tissue densities. Some of these sound waves bounce back and the ultrasound computer interprets the waves into images of Baby's body parts.

While you may not be interested in the technicalities of ultrasound, you're probably interested in what you'll feel and what you'll see. What you experience all depends on how pregnant you are.

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