Hearing loss from exposure to loud noises is cumulative and irreversible; if such exposure starts in infancy, children can live "half their lives with hearing loss," said Brian Fligor, director of diagnostic audiology at Children's Hospital Boston.
Because a young child's ear canal is much smaller than an older child's or an adult's...the sound pressure entering the ear is greater. An infant might perceive a sound as 20 decibels louder than an older child or an adult. The shorter length of the ear canal increases dangerous noise levels in the higher frequencies, which are crucial to language development.
