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Ultrasound technology is often used to listen to an unborn baby's heart beat (after 12 weeks of pregnancy). Caregivers can use a hand-held portable doppler (or 'sonocaid') that emits sound waves of about 2 MHz of frequency to detect changes in blood flow through the baby's heart to produce an audible sound.Source: Link
Ultrasound technology is often used to listen to an unborn baby's heart beat (after 12 weeks of pregnancy). Caregivers can use a hand-held portable doppler (or 'sonocaid') that emits sound waves of about 2 MHz of frequency to detect changes in blood flow through the baby's heart to produce an audible sound.
Source: Link
