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The prenatal period that marks the beginning of waking and sleeping cycles, as well as the ability to hear sounds from outside the uterus, is the third trimester, specifically around 25 weeks gestation. During this time, the developing fetus begins to exhibit sleep-wake patterns and can respond to external sounds, indicating the maturation of the auditory system. These developments are critical for preparing the fetus for life outside the womb.

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1w ago

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