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White noise for babies: Does it help them sleep?
Medically Reviewed Kandra Becerra, Founder and certified Sleep Consultant at Rocky Mountain Sleeping Baby
Written by Cradlewise Staff
It comes as a genuine surprise to most parents when they learn that the womb is actually very loud. Not whisper-quiet and peaceful, but consistently loud, roughly as loud as a vacuum cleaner running in the next room, all day and all night, for nine months.
So when your newborn arrives in a quiet bedroom and struggles to settle, it is because they are not used to sleeping in silence. This silence is unfamiliar. White noise for babies works precisely because it bridges that gap, recreating the steady sound environment your baby has already spent most of their life inside.
But does white noise actually help babies sleep? Is white noise for babies safe? How loud should it be? And when should you stop using it?
This guide covers all of these questions and some more with the help of Kandra Becerra, Founder and certified Sleep Consultant at Rocky Mountain Sleeping Baby.
What is white noise
The concept of white noise stems from ‘white light.’ We get white light by combining all the colors of the visible spectrum. In the same way, we get white noise by combining all the different sound frequencies.
White noise contains every audible frequency at equal intensity, creating a steady, uniform ‘shhhh’ sound that has no pitch, no rhythm, and no pattern. White noise sounds like the static sound of the TV and the constant hum of the air purifier.
Hence, white noise is excellent as a background noise to mask other sounds.
Does white noise actually help babies sleep
Yes, and it is backed up by several decades of research.
A study published in Archives of Disease in Childhood found that 80% of newborns fell asleep within five minutes of white noise exposure, compared to just 25% in the control group. Another study published in the Journal of Clinical Nursing found that white noise also significantly reduced crying duration and increased sleep time in babies with colic.
All these findings lead to the same conclusion: a steady sound masking reduces the arousals triggered by environmental sound changes in your newborn baby, allowing sleep cycles to consolidate.
How does white noise help baby fall sleep
A consistent, uniform sound is exactly what makes it useful for babies to fall asleep. Your baby’s brain is wired to notice change.
A car door outside, birds chirping on the trees, a sibling’s voice in the next room, a floorboard creak, each sudden sound can trigger a startle or partial arousal. White noise masks these sound variations by providing a constant acoustic backdrop that drowns out the fluctuations your baby’s brain would otherwise respond to.
How white noise works as a sleep cue?
Beyond masking, white noise also functions as a conditioned cue over time.
When the same sound plays consistently during every sleep window, your baby’s brain begins to associate it with winding down and sleeping. This is why white noise often becomes more effective over the first few weeks of use. This association in your baby’s brain will strengthen when you expose them to the same sound frequently.
Why the womb connection matters for newborns?
A study published in Plos One has measured the sound level inside the uterus and found it ranges from 70-90 dB. The noise in the womb environment is roughly equivalent to a running vacuum cleaner or a busy restaurant. Amniotic fluid, blood flow, maternal heartbeat, and muffled external sounds all contribute to a continuous, low-frequency acoustic environment that your baby has been exposed to since before they could hear.
Your newborn doesn’t need complete silence to sleep, but consistent noise at the same frequency. White noise not only masks disruptions, but also recreates a familiar and sensory safe sleep environment for your newborn outside your womb.
Did you know?
Combining a mother’s heartbeat sounds with white noise reduced heart rate, improved sleep, stabilised mood, and increased milk consumption and the rate of weight gain in NICU infants.
Is white noise bad for babies
No. White noise is not bad for babies when used at the correct volume and distance.
The concern about white noise and hearing safety arose largely from a 2014 study published in Pediatrics, which tested 14 commercially available infant sound machines and found that all of them exceeded 50 decibels when placed at the usual crib-rail distance, and three exceeded 85 dB at maximum volume.
White noise machines correctly used are not primarily harmful to a baby’s hearing or auditory development.
Kandra also addresses a specific concern about vulnerable babies: “Premature infants and children with known hearing concerns may have different sensitivities, so parents should always follow guidance from their paediatrician or audiologist. In general, safe volume recommendations apply to all infants, and sound machines should never be placed directly next to the sleep space.”
The bottom line: Is white noise bad for babies? No, not when placed correctly and played at a safe volume. The risk is in the machine placed on the crib rail at maximum volume, not in the concept of white noise itself.
How loud should white noise be for baby
This is the question that matters most for your baby’s safety.
- Maximum volume: 50 dB or below, measured at the baby’s ear level (mattress height), not from across the room.
- Placement: at least 7 feet (approximately 2 metres) from the crib.
- For premature babies: below 45 dB, as their auditory systems are less developed (NICU guidance).
But throwing around numbers and random dB levels can be a little confusing. So we have compiled a list of some common everyday noises and their average decibels to give you the context of what we are talking about when we say ‘safe noise levels.
Safe Noise Levels
Noise | Average decibels (dB) |
Leaves rustling, soft music, whisper | 30 dB |
Average home noise | 40 dB |
Normal conversation, background music | 60 dB |
Office noise, inside the car at 60 mph | 70 dB |
Vacuum cleaner, the average radio | 75 dB |
Heavy traffic, window air conditioner, noisy restaurant, power lawnmower | 80–89 dB (sounds above 85 dB are harmful) |
Subway, loud conversation | 90–95 dB |
Boom box, ATV, motorcycle | 96–100 dB |
Sports crowd, rock concert, loud symphony | 120–129 dB |
The practical problem is that most parents set volume by feel rather than by measurement, and many machines have no dB markings on their dials. A free decibel meter app like NIOSH endorsed by CDC can resolve this problem.
Cradlewise Note: If you are using a Cradlewise Smart Crib, the built-in sound system is calibrated to operate at safe volume levels within the crib environment. You can also layer and customize sounds through the Cradlewise app. More on this in the final section.
White noise vs. pink noise vs. brown noise: What is the difference
All three types of noise create a steady sound that can help mask sudden noises in your baby’s environment. What makes them different is the mix of sound frequencies they contain.
White noise vs. pink noise vs. brown noise difference
Noise type | What it sounds like | What it does | Best for | Safe to loop all night? |
| White noise | A steady ‘shhhh’- fan, static, running water | Contains all frequencies at equal intensity; creates a uniform sound mask | Newborns; noisy households; early sleep training | Yes. At 50 dB or below, machine 7+ ft from crib |
| Pink noise | Softer than white noise; like gentle rain or a low breeze | More energy in lower frequencies; smoother to the ear than white noise | Babies sensitive to high-pitched sounds; lighter sleepers | Yes. The same volume guidelines apply |
| Brown noise | Deep, rumbling like distant thunder or a waterfall | Heaviest low-frequency emphasis; the deepest-sounding of the three | Babies who respond best to deep, resonant sounds | Yes. The same volume guidelines apply |
| Womb sounds | Swooshing, heartbeat, muffled ambient sounds | Mimics the intrauterine environment directly; familiar from before birth | Newborns in the first weeks; very unsettled babies | With caution: heartbeat sounds have variable rhythm; may stimulate some babies |
| Nature sounds (steady) | Constant rainfall, a brook, ocean with no spike | Similar to pink noise in profile when steady; naturally pleasant | Older babies and toddlers; parents who find pure white noise grating | Yes. Choose tracks without spikes or crescendos |
Kandra adds, “What I generally recommend avoiding are sounds with an ebb and flow, such as rain, ocean waves, or heartbeat sounds. While these can be relaxing, the fluctuations in volume and rhythm may become stimulating for some children and can potentially interfere with the process of connecting sleep cycles throughout the night.”
When to stop using white noise for baby
There is no fixed age.
“ Many children never need to wean from white noise, as it can remain a healthy part of a bedtime routine. If parents wish to discontinue it, I recommend gradually reducing the volume over several weeks rather than stopping abruptly. This allows the child to adjust without significantly disrupting sleep.”
That said, if you want to wean off white noise at some point, there are useful signals to watch for.
Signs your baby may be ready to wean
- They have been sleeping consistently well for several months.
- They no longer startle easily at household sounds during wake windows.
- They are settling easily at naps and bedtime without needing the sound as a strong sleep cue.
- They are old enough, typically from around 12 to 24 months, to begin building sleep independence without it.
Signs it may be too soon
- Night wakings increase when white noise is turned off.
- Settling at naps or bedtime becomes significantly harder.
- Your child is going through a sleep regression, developmental leap, or environmental disruption. Or if you are traveling or planning to travel with your baby. Avoid weaning during a period of change.
How to wean gradually
Rather than switching the machine off entirely:
- Reduce volume slowly over 1-2 weeks. A drop of 5 dB every few days is a reasonable pace.
- Start with naps before nights, since nap sleep is lighter.
- Once naps are settled without white noise, approach nights the same way.
- If sleep deteriorates significantly at any point, slow down or pause the wean.
Using white noise in the Cradlewise app
If you are already a Cradlewise parent, here is how to set up your baby’s personalised sound environment through the app.
The Cradlewise Smart Crib includes a built-in sound system designed to operate at safe volume levels within the sleep environment. Through the Cradlewise app, you can:
- Choose from a library of sound types including white noise, pink noise, womb sounds, heartbeat sounds, and nature sounds.
- Choose your preferred ambiance of light rain, heavy rain, soft breeze, or waves.
- Customize the white, pink, and brown noise sleep tracks by adding layers of multiple sounds like heartbeat, wind, and rain to them. It will be your own customized mix.
- You can save the track by tapping on Save.
- Set volume levels and preview how they sound before your baby goes down.
- Programme sounds to play through specific sleep windows or all night.
- Monitor whether the sounds are actually supporting sleep through the Cradlewise sleep tracking data.
Unlike a standalone sound machine, the Cradlewise system integrates sound with the crib’s responsive soothing features. When the crib detects early wake signs, it can adjust sound alongside gentle motion to help your baby settle back into the sleep cycle without you needing to enter the room.
Conclusion
White noise for babies works. The womb is noisy, newborns are primed to find steady sound calming, and a correctly placed sound machine at a safe volume is one of the most evidence-backed sleep tools available to parents.
The three things worth remembering for parents: 50 dB or below at mattress height. Machine at least 7 feet from the crib. And there is no rush to wean off if white noise is working for your family, it can keep working for as long as you want it to.
FAQs
Q: Are sound machines safe for babies?
A: A correctly used white noise machine is not harmful to a baby’s hearing or auditory development. Keep sound machines 50 dB or below and 7 feet away from your baby’s crib.
Q: Is white noise safe for babies?
A: Yes, when used at the correct volume and distance. A white noise machine should be placed at least 7 feet from the crib, and volume at or below 50 dB measured at mattress height.
Q: How loud should white noise be for a baby?
A: The American Academy of Pediatrics recommends 50 dB or below at the baby’s ear level. Premature babies and those with hearing concerns should have sound kept lower than 45 dB.
Q: When should I stop using white noise for my baby?
A: There is no fixed age. White noise can remain a safe and healthy part of a bedtime routine through toddlerhood and beyond if a child continues to sleep well with it.
Q: What is the difference between white, pink, and brown noise for babies?
A: White noise, pink noise, and brown noise all help block out background sounds that might wake your baby. White noise sounds like static or a fan. Pink noise sounds softer and gentler like steady rain. Brown noise sounds like a deep rumble or distant waterfall.
Q: Is white noise good for babies, or is silence better?
A: Research consistently shows that white noise is more effective than silence for newborn sleep onset. Newborns are unfamiliar with a silent environment, and white noise bridges that gap.
Q: Can white noise played through the phone be effective?
A: “Yes, white noise played through a phone can be effective, particularly for travel or occasional use. However, phone speakers often have limited sound quality and volume control. For regular use, I typically recommend a dedicated sound machine placed at a safe distance from the crib, says Kandra Becerra, Certified Sleep Consultant.
You may also like:
- How much sleep does a 2 year old need?
- Newborn sleep patterns: What to expect once baby arrives.
- The science of sound and baby sleep.
Sources:
- Newborns fall asleep with white music. PubMed. 1990. White noise and sleep induction.
- White noise reduces crying duration and increases sleep time in colicky babies. Journal of Clinical Nursing. 2017. Comparison between swinging and playing of white noise among colicky babies: A paired randomised controlled trial.
- The sound level inside the uterus. PLOS One. 2018. A description of externally recorded womb sounds in human subjects during gestation.
- White noise and hearing safety. Pediatrics. AAP. 2014. Infant Sleep Machines and Hazardous Sound Pressure Levels.
- Effects of a mother’s heartbeat sounds with white noise on NICU infants. Annals of Palliative Medicine. 2021. Effect of the sound of the mother’s heartbeat combined with white noise on heart rate, weight, and sleep in premature infants: a retrospective comparative cohort study.
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