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Some parents feel that MP3 is so fashionable that they want to "enjoy" it too. However, because the baby is younger, they may control the volume. If the volume is loud, there is damage to the baby's hearing. In addition, the earbuds of the earphone are directly inserted into the ear, the sound stimulates the eardrum directly, and then through the eardrum, the time is long, the eardrum is very easy to fatigue, and it can also cause hearing loss. So, when the baby listens to music and listen to the story, it's better to use the outside, and the volume is not too loud.
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