can be a sign that the baby has a chromosomal abnormality, such as Down syndrome. This test is available at a number of university medical centers around the U.S. As with ultrasound, there is no ...

Ultrasound imaging creates a picture of something that cannot be seen directly, such as an unborn baby in the womb, or faults and ... since the sound had to travel down to the crack and back ...

Ultrasound can be used to measure the diameter of the head of a baby in the womb. When ultrasound reaches the baby’s head at A, some ultrasound is reflected back to the detector and produces ...