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A white noise machine produces a gentle and soothing sound that relaxes the baby and helps them to sleep. The device comes typically with different sound options that a newborn is familiar with like a heartbeat or a lullaby. Some white noise machines even come with a timer that lets you set the time for playing the sound.

https://youtu.be/Kcw1S7h6tDs
https://www.parentingscoop.com/do-you-leave-the-baby-with-white-noise-the-whole-night/