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The music that Lia and Liron play for the baby penetrates the amniotic fluid and vibrates the fetus's eardrum. Sound waves are passed on to three tiny bones: the hammer, the anvil, and the stirrup. The cochlea, in the inner ear, receives the sound waves, encodes them into electrical pulses, and transfers them to the brain.
The voices the fetus hears in utero are impressed onto his memory, so that, for instance, he recognizes his mother's voice soon after birth.