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A: Your baby's heartbeat is one of the first things your doctor will look for on an ultrasound, a test that uses sound waves to give off visual images of your baby and placenta as well as your uterus and other pelvic organs.
I'm often asked if you can tell the baby's sex by the heart rate -- on the myth that one sex is faster than another -- but that is just an old wives' tale. Some people claim they can tell the baby's sex by the way you're carrying, but, again, there is no scientific proof that this is true. Still others use a pendulum test in which an object is suspended over the pregnant belly and the baby's sex is predicted depending on which way the pendulum swings. Again, there is no documented proof that this test works. Don't get frustrated if the doctor can't tell what the baby's sex is on ultrasound. You'll know soon enough.