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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.
Full Answer. If an early ultrasound is not done, the first chance to hear a baby's heartbeat is at about 10 weeks of gestation using a fetal Doppler, which is a handheld ultrasound device. Baby Center points out, however, that it is more common to pick up a heartbeat with a fetal Doppler device at 12 weeks.