The best white noise for babies is a continuous, low-pitched, monotonous sound played at around 50 to 60 decibels (about the volume of a quiet shower) from at least 2 metres away from the cot. Pink noise and brown noise are usually more effective for sleep than classic white noise, because the lower frequencies more closely mimic the womb. The wrong type, the wrong volume, or the wrong distance can do nothing at all, or in some cases, make sleep worse.
Does white noise actually work for babies?
For most babies, yes. The reason it works comes down to where they spent the first 9 months of their life.
Inside the womb, babies hear a constant, rumbling drone of blood flow, heartbeat, and the muffled sounds of the outside world filtering through their mother's body. By the third trimester, the volume inside the uterus has been measured at around 80 to 90 decibels, which is roughly the same as a vacuum cleaner. The idea that newborns need silence to sleep is one of the most stubborn parenting myths going.
When you play continuous low-frequency sound during sleep, you are giving your baby's brain a signal it already recognises. The constant noise creates a stable auditory floor that masks the sudden, sharp sounds (a door closing, a sibling laughing, traffic outside) that would otherwise jolt them awake between sleep cycles.
The result, when done well, is faster settling, longer naps, and fewer wakings. The result, when done badly, is no effect at all, or a baby who becomes dependent on a specific sound that they cannot recreate elsewhere. The difference is in the details below.
White noise vs pink noise vs brown noise: which is best for babies?
Most parents use "white noise" as a catch-all term. Technically, there are three different sound profiles, and they affect babies differently. The differences matter when you are picking a machine or a setting.
White noise
The classic version. All audible frequencies are played at equal intensity, which creates a static-like, slightly harsh sound. Think of an untuned TV channel or a fan running on high. White noise is excellent for masking sharp environmental sounds, which is why it works well for blocking out a noisy household.
The downside is that classic white noise can feel a little tinny or piercing to some babies, especially newborns. The higher-frequency content makes it less womb-like than the alternatives below.
Pink noise
Pink noise lowers the higher frequencies, leaving more emphasis on the deeper, rumbling tones. The result sounds like steady rainfall, a waterfall in the distance, or leaves rustling in a strong wind. Pink noise is closer to the natural sounds babies hear in the womb and is widely considered more effective for sleep than classic white noise.
If your baby is fussy at the wind-down but settles once they are asleep, pink noise is usually the right setting.
Brown noise
Even deeper. Brown noise emphasises the lowest frequencies, sounding like a steady, low rumble. Imagine a heavy storm with no thunder, or the deep hum of a jet engine from inside the cabin. Brown noise is the closest auditory match to the uterine environment, which is why many sleep consultants recommend it for newborns and for babies who struggle with the witching hour.
The trade-off is that brown noise masks sharp environmental sounds less well than white noise, since most household disturbances are higher-pitched. For a baby in a noisy environment, white noise still wins on masking. For a baby in a quiet house, brown noise tends to win on settling.
Womb sounds, heartbeats, and shushing
Some machines and apps offer specific recordings of heartbeat, womb whoosh, or rhythmic shushing sounds. These work for some babies, especially newborns under 8 weeks. The drawback is that they often contain a slight repeating loop, which the developing brain may notice and find irritating once the baby is past 12 weeks. Continuous noise without a discernable pattern almost always outperforms looped recordings past the newborn stage.
The short version: start with pink noise or brown noise for sleep. Reserve classic white noise for environments where masking outside sounds is the priority.
How loud should white noise be (and how close to your baby)?
This is the single most misunderstood part of using white noise, and the place where most parents go wrong.
The right volume for ongoing sleep is around 50 to 60 decibels at the baby's ear. That is roughly the volume of a quiet shower or moderate rainfall. It should be quiet enough that you can comfortably hold a conversation over it from across the room.
The machine should be at least 2 metres (6.5 feet) away from your baby's cot or bassinet, never inside the cot, and never directly above their head. Most major paediatric guidance recommends this distance specifically because infant hearing is more sensitive than adult hearing and prolonged loud exposure too close to the ear has been associated with hearing concerns.
A simple rule: if you can hear it clearly from the next room, it is too loud.
The exception to the volume rule is calming a very upset baby. To break through hard crying, you can briefly turn the volume up to roughly match the volume of the crying itself, because a baby cannot hear soft sounds when they are screaming. Once they settle, turn it back down to the regular 50 to 60 decibel level for sleep.
Continuous loud exposure (above 70 decibels for hours) is not recommended. The Mayo Clinic guidance on infant care and the American Academy of Pediatrics safe sleep recommendations both emphasise keeping sleep environments calm and safe. White noise should be background, not foreground.
When to use white noise (and when not to)
White noise is not a "leave it on all day" tool. It works best when it is associated with specific sleep moments.
Naps
This is the primary use case. Turn the noise on at the start of the wind-down routine, leave it on through the nap, and turn it off when your baby wakes. Over time, your baby's brain learns to associate the sound with sleep, which makes settling faster every time.
If your baby is fighting naps and you are not sure whether it is timing or environment, our wake windows by age guide walks through how to spot the difference.
Night sleep
White noise works particularly well overnight because the household is otherwise quiet, which means small sounds (a creaking floorboard, the heating clicking on) become disproportionately loud. Continuous background noise smooths over those gaps.
For overnight use, leave the machine on for the full sleep period rather than running on a timer that switches off at 30 or 60 minutes. The risk with timers is that the machine cuts out during a light sleep phase and the sudden silence wakes your baby. Continuous, all-night sound is more effective than intermittent.
The witching hour and fussy moments
Late afternoon meltdowns between 5pm and 9pm are common, especially in the first 12 weeks. A combination of steady motion, dim lights, and white noise can break the spiral. Our guide on how to calm a fussy baby covers the broader witching hour playbook.
In the car or stroller
White noise during car naps or stroller naps can mask traffic sounds, conversations, and the sharper noises of being out and about. A portable machine clipped to a stroller or set in the car footwell (never near your baby's ear) helps stretch out-of-house naps.
When not to use it
White noise is not a substitute for an appropriate sleep schedule. If your baby's wake windows are wrong, no amount of white noise will fix it. White noise also cannot solve hunger, discomfort, or illness. Before reaching for the machine, run the basic checklist: full, comfortable, appropriate sleep timing, calm environment.
What features actually matter in a white noise machine
You can spend anywhere from £10 to £150 on a white noise machine. Most of the differences do not matter for actual sleep. A few do.
Sound type. Look for true continuous pink or brown noise, not just rainforest sounds with bird calls or whale songs layered in. Anything with a recognisable repeating pattern is worse than steady noise.
Volume control. A wide range matters, not just because babies need quiet levels for sleep, but because you want the ability to briefly turn it up to calm a screaming baby and then bring it down.
No automatic timer (or one you can disable). Auto-off timers are the most common annoying feature on cheap machines. Look for a machine that can run continuously for the whole night.
Portability. A machine you can take to a friend's house, to grandparents, on holiday, and on day trips is a machine that will still be useful at 18 months. Battery-powered or rechargeable portable machines are usually worth the small premium.
Simple controls. At 3am, with one hand holding a baby, you do not want to navigate menus. Physical buttons or a single dial beats an app every time.
No screen or bright light. Some machines double as nightlights, which sounds useful and is in fact a disadvantage. Light suppresses melatonin and is the enemy of sleep. If you want a nightlight, use a separate dim warm-toned bulb.
Clip or strap option. A machine with a clip or strap is more flexible than a standalone unit. You can attach it to a stroller, a car seat handle, or a nappy bag.
This combination of features is exactly why we built our LullaHush™ portable white noise machine: continuous pink and brown noise as the primary settings, no looping sound effects, a wide volume range from quiet to break-through-the-crying loud, no timer constraint, no screen, and a clip that attaches to a stroller, cot, or nappy bag. It is the machine we wished existed when we were first parents, designed for the moments when nothing fancy is needed except a sound that just works.
When to stop using white noise (and how)
White noise is not something you have to wean off. Many adults use it themselves and there is no medical reason a child cannot keep using it through toddlerhood and beyond.
That said, some families want to phase it out, usually around 18 to 24 months when the baby is sleeping through the night and the dependency on environmental cues is less critical. If you decide to wean, do it gradually.
The standard approach: reduce the volume by 10 to 20 percent every few nights for two to three weeks. Most children adapt without noticing. If they wake more frequently during the wean, hold the current volume for an extra week before reducing further.
If your child is going through a sleep regression, an illness, or a major life change (new sibling, new house, starting daycare), pause the wean and resume once things have settled. There is no race to remove white noise.
Common mistakes parents make with white noise
A few errors come up over and over. If white noise is not working for your baby, it is almost always one of these.
The volume is too low. You set it at a polite background level because it feels respectful. The baby cannot hear it over the rumble of the household and gets no benefit. For settling, slightly louder is more effective than slightly quieter.
The volume is too high. The opposite mistake. Cranked up to drown out a fussy baby and then left there. Continuous loud exposure is not recommended. After the baby settles, drop the volume back to background level.
The machine is too close. Inside the cot or on the bedside table directly next to the baby's head. Move it to at least 2 metres away.
Using sounds with patterns. Ocean waves with seagull calls, rainforest with frogs, lullaby songs. Patterns become predictable to the developing brain and lose their effect. Stick with continuous noise.
Running on a 30-minute timer. The machine switches off mid-nap and the sudden silence wakes the baby. Use a machine without a forced timer.
Expecting white noise to fix everything. It is a tool, not magic. If your baby is overtired or undertired, white noise will not save the nap. Get the schedule right first.
If you have ticked off the schedule and the environment is calm but your baby still will not settle, the issue may be the wind-down itself. Tools like our LullaBear™ provide the steady, rhythmic patting that helps babies settle when sound alone is not enough, particularly during sleep regressions like the 4 month sleep regression.
Why we built LullaHush
Most white noise machines fall into one of two buckets. Cheap ones with bad sound, looping recordings, and forced timers that switch off mid-nap. Expensive ones with bright screens, app-controlled menus, and more features than any tired parent will ever use.
We built LullaHush™ for the middle ground that did not exist. Continuous pink and brown noise as the core settings. A volume range that goes from quiet enough for a 6 month old in a calm room to loud enough to settle a screaming newborn in a witching hour spiral. No bright screen. No looping rainforest sounds. No 30-minute timer. A clip that attaches to a cot, a stroller, a nappy bag, or a car seat handle.
It is one of three tools in the Livvewell settling system, alongside LullaBear™ (for the rhythmic patting) and CradlePod™ (for the gentle positioning during awake-but-fussy windows). The three work together because most settling problems are not one thing.
Free download: the Calm Baby Guide
We built a free 14-page guide for parents working through the daily reality of newborn sleep: settling, wind-down routines, wake windows, and the small adjustments that compound. Plain language, no fluff. You can download the Calm Baby Guide here, no purchase required.
Frequently asked questions
Is white noise safe for newborn babies?
Yes, when used at appropriate volume (50 to 60 decibels) and distance (at least 2 metres from the cot). White noise is widely used in NICUs and recommended by many paediatric sleep consultants from birth.
What is the difference between white noise and pink noise?
White noise plays all audible frequencies at equal intensity, creating a static-like sound. Pink noise reduces the higher frequencies, resulting in a deeper, softer sound similar to rainfall. Pink noise is generally preferred for baby sleep because it more closely mimics the womb environment.
How loud should the white noise be?
Around 50 to 60 decibels at your baby's ear, which is roughly the volume of a quiet shower or moderate rain. If you can hear it clearly from the next room, it is too loud. Keep the machine at least 2 metres away from the cot.
Can my baby become dependent on white noise?
Sort of, but it is not a problem. Babies become associated with sound cues, which is the whole point. The "dependency" is the same as the dependency on a dark room or a sleep sack. If you ever need to remove it, a gradual volume reduction over 2 to 3 weeks works for most children.
Should I leave the white noise on all night?
Yes. Continuous all-night sound is more effective than timed playback. Machines that cut off after 30 or 60 minutes risk waking your baby during a light sleep phase, which is the opposite of what you want.
Does white noise help with sleep regressions?
It helps maintain a consistent sleep cue, which makes regressions easier to ride out. It is not a fix on its own. The underlying driver of a regression (developmental leap, schedule change, new skill) needs to be addressed alongside the environment.
Can I use white noise outside of sleep, like in the car?
Yes. White noise during car naps, stroller naps, or fussy out-of-house moments can help. Use a portable machine and keep it at least 30cm away from your baby's ear.
Do I have to wean my baby off white noise?
No. There is no medical requirement to stop using white noise. Many adults use it themselves. If you want to phase it out, do it gradually with small volume reductions over several weeks.
What sound is best for newborns specifically?
Brown noise or deep pink noise tends to work best for newborns under 8 weeks, because the low-frequency rumble most closely matches the in-utero sound environment. Womb-specific sound recordings can also work for the first few weeks but usually become less effective past 12 weeks.
The bottom line
White noise is one of the simplest, cheapest, and most effective sleep tools available, when you use the right kind at the right volume from the right distance. Most parents who try it and conclude it does not work have made one of three mistakes: the sound type is wrong, the volume is wrong, or the timing of when they switch it off is wrong.
Get those three right and you usually see results within a few naps. Pink or brown noise. 50 to 60 decibels. At least 2 metres from the cot. Running continuously through the full sleep period. No looping sounds, no timer cut-off, no bright screen on the machine.
That is the whole playbook. White noise is not a miracle. It is one piece of a system. The other pieces are the right schedule, the right wind-down, and the right tools for the moments when sound alone is not enough.