If you've ever stood frozen outside a nursery door at 2am, holding your breath so a single creak doesn't undo forty minutes of work, you already understand why white noise machines sell by the million. They genuinely help a lot of babies settle. But whether a sound machine helps your baby or quietly works against them comes down to one thing most parents are never told: volume.
So is white noise safe for babies? Mostly yes — but with one rule most machines quietly break. Here's what the research actually shows: the part that helps, and the part that matters more than the brand on the box.
Does white noise actually work?
of newborns fell asleep within five minutes with white noise.
fell asleep that fast in the quiet control group.
Spencer et al., Archives of Disease in Childhood, 1990 — a small but landmark randomised trial of 40 newborns. The effect is real; the evidence base is still thin, which is worth holding honestly.
Why sound settles a baby in the first place
A newborn has never known silence.
For nine months, the womb was a loud place — a constant wash of blood flow, muscle, and a heartbeat, never quiet for a second. Then a baby arrives into a world where a silent bedroom is suddenly broken by a door, a sibling, a passing car. A steady, low background sound does two useful things: it masks those sudden noises so they don't cross the threshold that triggers waking, and it softens the startle reflex that jolts so many newborns out of light sleep. That's the mechanism behind the settling effect — not magic, just a familiar, predictable sound floor.
Is white noise bad for babies? It comes down to volume
In 2014, a team of pediatric researchers tested fourteen popular infant sleep machines at maximum volume and published the results in Pediatrics. The findings are the reason this article exists.
14 machines tested at max volume
exceeded 50 dBA up close — the recommended noise limit for hospital nurseries.
exceeded 85 dBA — loud enough to risk noise-induced hearing damage over a long night.
Hugh et al., Pediatrics, 2014. 85 dBA for more than eight hours exceeds the occupational noise limit set for adults — and an infant's ear is more vulnerable, not less.
This is the honest tension of white noise. The same sound that helps a baby fall asleep can, at the wrong volume and the wrong distance, become a risk. The good news is that the fix is simple and entirely in your control.
Sound that helps
- Around 50 dB or lower at the crib
- Placed across the room, not on the rail
- A steady, consistent tone
- Used to settle, then eased back
Sound that can harm
- Cranked to maximum to "be sure"
- Sitting on the crib rail by the ear
- Harsh, hissy, or distorted at volume
- Left at full blast all night, every night
How loud should white noise be for a baby?
Pediatric guidance, drawn directly from that 2014 study, is refreshingly concrete — and almost none of it is about which machine you buy.
- ✓Keep it around 50 dB or lower measured at the crib — about as loud as a quiet shower in the next room.
- ✓Place the machine at least ~7 feet (2 m) away, never in the crib or on the rail.
- ✓Don't run it at maximum. If you can't hold a quiet conversation over it, it's too loud.
- ✓Favour a consistent, lower-frequency sound over a sharp, hissy one — gentler to listen to and to mask with.
- ✓Consider a timer or auto-off rather than blasting it at full volume the entire night.
Should you run white noise all night?
One open question is whether continuous, all-night white noise is ideal over the long term. A 2024 scoping review looked at exactly this and reached an honest conclusion: the evidence is still developing. The first year of life is when a baby's hearing is busy calibrating to the sounds of speech, and researchers reasonably ask whether a constant sound floor could compete with that. The current pediatric lean is toward cautious, time-limited use — enough sound to settle and protect sleep, not a wall of noise from dusk to dawn. It's not a reason to fear white noise. It's a reason to use it deliberately.
Where Lullam fits
We make a sound machine, not a substitute for quiet.
A sound machine can't fix an overtired schedule, replace a bedtime routine, or stand in for a paediatrician's advice. What it can do is give your baby a familiar, consistent sound cue at a volume that stays on the right side of the research.
The Lullam baby sleep sound machine was built around a single idea — better sleep starts with consistency, not volume. It runs womb-mimic, white, pink and brown noise and soft lullabies at pediatric-safe decibel levels with a hard cap, a memory-locked timer so you're not running it at full blast all night, and a glow that won't wake the room. It's the boring, responsible version of a sound machine, which is exactly the point.
The quiet takeaway
White noise is one of the few baby-sleep tools with real evidence behind it — and one of the easiest to get wrong, in one specific way. The sound isn't the risk. The volume is.
So here's the only test you need at bedtime: stand where your baby sleeps and try to talk over the machine in a normal, quiet voice. If you can be heard without raising your voice, you're almost certainly in the safe zone. You don't need a decibel app or a chart to check it. You just need to listen.
If you want the bigger picture on how the first 1000 days shape your baby's sleep, feeding and development, here is our long-form guide — written with the same intention as this one: useful, honest, and quietly grounded in research.
Explore the Lullam Sleep Sound Machine
Womb-mimic, white, pink and brown noise at pediatric-safe, decibel-capped levels — with a memory-locked timer. Designed around consistency, not volume.
See how Lullam worksFrequently asked questions
Is white noise safe for babies?
Yes — at a safe volume. There's no good evidence that low-level white noise harms babies. The caution from pediatric research is about volume, not the sound itself: keep a white noise machine around 50 dB or lower at the crib and place it across the room, never in or on the cot.
How loud should white noise be for a baby?
Around 50 decibels or lower, measured at the crib — roughly as loud as a quiet shower in the next room. Place the machine at least ~7 feet (2 m) away and never run it at maximum. A simple test: if you can talk over it in a normal, quiet voice, you're in the safe range. A decibel-capped baby sleep sound machine takes the guesswork out of this.
Can you play white noise all night for a baby?
Most experts lean toward time-limited use rather than full-volume sound from dusk to dawn. Using white noise to settle your baby and then easing it back — or running a timer — keeps the benefit while staying cautious about continuous all-night exposure, which is still being studied.
What kind of white noise is best for a newborn?
Many newborns settle best to lower-frequency, womb-like sound — often called womb-mimic, pink, or brown noise — rather than sharp, hissy white noise, because it's closer to the constant sound they heard before birth. The best sound is simply the consistent one your baby responds to.
When should you stop using white noise?
There's no fixed age. Many babies benefit through the first year, and some toddlers keep it for comfort. When you're ready to stop, lower the volume gradually over a week or two rather than cutting it off all at once.
Sources
Spencer et al. — White Noise and Sleep Induction, Archives of Disease in Childhood (1990) · Hugh et al. — Infant Sleep Machines and Hazardous Sound Pressure Levels, Pediatrics (2014) · Continuous White Noise Exposure During Sleep and Childhood Development: A Scoping Review (2024) · Applications of White Noise in Maternal and Neonatal Care: A Comprehensive Review