There are different kinds of sounds. An infant hears a new sound and responds with interest. After repeated exposure to the same sound, one can expect the infant to Decrease responsiveness to the sound.
A lot of infants often startle or "jump" when they hear loud noises. When a baby is 3 months, the infant often recognizes and calms to the voice of their parent's.
When the child is 6 months, the infants often turn their eyes or head toward a new sound and any kind of repeated sounds.
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