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Scientists have known for years that maternal speech is audible in utero; in other words, a fetus can actually hear the mother’s voice from inside the womb. But more recent research has found that a developing fetus can hear a far broader range of tones that come from outside the mother’s body as well. It used to be assumed that the mother’s internal bodily sounds (the beat of the heart, the swooshing of the amniotic fluid) drowned out all external noises, such as music.


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