4-5 months: The baby's outer ears start to develop after about 5 weeks into fetal development. The bones in the inner ear that transmit sound won't be fully developed until after birth but start to function at around the 4-5 month time. Look here to learn more: http://health.Shorehealth.Org/ency/animations/fetal-ear-development.Htm.
Answered 5/20/2013
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After birth: Sense of hearing works after birth.
Answered 5/20/2013
5.1k views
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