Babies tend to like White noise. They’re used to it. Before making their grand debut, your baby spent their days and nights awash in the reassuring hum of human life.1 Your beating heart, the sound of the blood rushing around your body, and the rhythmic in and out of your every breath created a comforting cacophony somewhat akin to the roar of a vacuum. For comparison, the "shushing" maternal sounds in utero range anywhere from 70 to 91 decibels, while a vacuum cleaner is typically 70 to 80 decibels.2 In other words, the womb is not a quiet place!
Why White Noise Helps Baby Sleep
White-noise machines create a comfortable, womb-like environment that calms anxious infants, encouraging them to stop crying and fall asleep faster. 3 White-noise machines also help babies stay asleep longer. It may seem like it works like magic, but the trick can be easily explained.
Ever wonder why your baby seems to sleep for only 20 minutes at a time? As your little dreamer snoozes, they cycle in and out of deep sleep and light sleep, experiencing brief periods of what’s often referred to as “sleep arousal” about every 20 minutes or so.4 Babies wake easily during the periods of light sleep and become anxious.5 Nap time is all too often over.
White noise can help silence your baby's built-in, 20-minute alarm clock by drowning out doorbells, rambunctious siblings and other potential disturbances during vulnerable phases of sleep. Should baby begin to stir naturally, the calming drone of the white-noise machine could provide a source of comfort, encouraging your still-sleepy baby to sink back into a deep sleep.
In 2014, the American Academy of Pediatrics warned against several white noise machines, citing that anything above 50 decibels could cause damage to a baby's hearing as well as cause other developmental delays.6 So before purchasing a white noise machine, be sure you do your homework to ensure your little one's safety.
Another potential pitfall: Battery-operated machines or machines that only work on a timer. Many babies will wake when their machine stops working, so choose a model you can leave on all night if need be.
Using Your Machine
Now that you’ve settled on the right machine, you’re probably wondering how best to use it. What volume works best? How loud is too loud?
You may have to adjust the volume on your white noise machine in order for it effectively calm down your crying baby. Once your little one has been soothed, adjust the volume to the level of a soft shower. If it seems uncomfortably loud to you, be sure to turn it down, as your little one may be uncomfortable also.