2Scroll Compressor History and Development 2OPERATING PRINCIPLES................................ 3Geometry of a Scroll....................................... 3The Scroll Set ................................................. 3Compression Process ...................................... 4Compliance .....................................................
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.
How soon can you hear a baby's heartbeat? A baby's heartbeat can usually be detected at 6 1/2 to 7 weeks into the pregnancy, according to the American Pregnancy Association. A healthy heartbeat at this stage of fetal development ranges from 90 to 110 beats per minute.