Medicine: The Womb Tune

It puts babies to sleep

The price is $40, but new parents may feel it is well worth it. For Rock-A-Bye-Bear is a Teddy bear that makes cranky infants drop right off to sleep. How? It is implanted with a device that plays the soothing sounds babies hear while still in the womb: the pulsing thump and whoosh made by blood coursing through their mothers' pelvic arteries.

The idea of using womb sounds to calm unruly newborns was first explored by the British and Japanese but did not hit the commercial big tune until Entrepreneurs Bob Bissett and Marie Shields teamed with...

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