Kids can also be over-sensitive to certain kinds of sounds. This is related to sensory integration and in some people the neural system adjusts automatically, w

Kids can also be over-sensitive to certain kinds of sounds. This is related to sensory integration and in some people the neural system adjusts automatically, while others might require SI therapy. This over-sensitivity is not due to the volume itself, but occurs later in the neural processing. I've seen it myself: a child would have no problems with loud music, but any kind of noise (as in, white noise) would be painful. This included hair dryers, vacuum cleaners, some power tools, and sounds of water/sea.