White noise refers to sounds that mask other sounds that might occur naturally in an environment. If you live in a city, for example, white noise could help block out noises associated with traffic. Specific sounds might be used to help encourage sleep regardless of environmental noises. Examples include rainforest or soothing beach sounds. There are even machines specifically designed for use with infants. Some are equipped with instrumental lullabies or even a heartbeat noise that is used to mimic that of the mother.
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