Pink or white noise, rhythmic sounds like a heartbeat, and sounds that mimic the womb environment are effective in helping babies fall asleep.
Here's a more detailed breakdown:
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Pink Noise and White Noise: These noises replicate sounds babies hear in the womb, creating a calming effect. They can also mask other distracting sounds.
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Rhythmic Sounds: The rhythmic sound of a heartbeat can be very soothing.
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Womb-like Sounds: Sounds that remind a baby of their time in the womb can be especially effective at soothing them to sleep.
The effectiveness of a particular sound can vary from baby to baby. Experimentation can help determine what works best for your child.