Can my baby sleep with white noise on?

The verdict

Yes. This is one of the few sleep gadgets a safe sleep body has looked at and come back broadly positive about.

Red Nose Australia's conclusion: it does not endorse specific settling techniques, but the limited evidence suggests white noise may help some babies, and Red Nose considers there are no known risks in using white noise. Its summary of the research is that there is "no harm in trying".

That is a lower bar than "recommended" and a much higher one than most sleep products clear.

What the evidence actually shows

Red Nose sets out two findings.

Researchers found that newborn babies exposed to white noise were more likely to fall asleep quickly. Babies who did not settle did settle after a feed – which is a finding about feeding as much as about noise.

And a study of babies with colic reported a decrease in crying when white noise was played.

Those are modest results and Red Nose describes them as limited evidence, not as proof. They are enough to support trying it and not enough to support buying anything expensive.

What it definitely will not do

Red Nose is careful here, and the caveat is the useful part: even with white noise, a baby is unlikely to fall asleep if they are still hungry, and they will likely still wake for a feed if the white noise continues overnight.

White noise is not a sedative. It masks the environment and provides a constant, predictable background. A baby waking because they need feeding, because they are uncomfortable, or because they are unwell will wake regardless.

And it has no bearing on the risk of sudden infant death. No body claims otherwise, and nothing about a settled baby substitutes for back sleeping, a clear cot and room-sharing.

What counts as white noise

Red Nose's definition is broader and cheaper than the market would have you believe: a constant background noise, or one that drowns out other sounds. It can be gentle shushing, quiet singing, an app or device with calming sounds, or just general household buzz.

An extractor fan, a radio between stations, a washing machine in the next room and the hum of a house all qualify. So does a parent shushing. Nothing here requires a purpose-built machine, and nothing suggests a purpose-built machine works better.

The practical rules that do apply

The published guidance on white noise itself is short. The guidance on what is allowed near a cot is not, and it governs how you use it.

Nothing in the cot. The Lullaby Trust's clear cot advice permits exactly two things in a cot: a firm, flat, waterproof mattress and lightweight bedding. That rules out a phone, a soft toy with a sound unit, a portable speaker or a sound machine clipped to the bars.

No cables anywhere near it. The Lullaby Trust warns about the risk of accidents with wires and leads once a baby can roll, reach and grasp, and asks that control units be kept out of reach. Anything mains-powered goes on the far side of the room with its cable secured.

Volume: nobody publishes a limit, so use judgement. No safe sleep body sets a decibel figure for home use, and this page will not invent one. The sensible approach is the one you can apply without a meter: place the device across the room rather than beside the head, keep it quiet enough that you can hear your baby over it, and set it no louder than a normal conversation. If you have to raise your voice over it, it is too loud.

Keep it audible-through, not audible-over. You need to be able to hear your baby. That is the same reason the Lullaby Trust asks you to stay in the same room for the first six months, and a sound machine that masks a baby's noises works against it.

Continuous or timed?

Red Nose does not take a view. The practical argument for a timer is that a baby who falls asleep to a sound and wakes into silence may notice the change; the argument for continuous is that the environment stays constant across a sleep cycle. Both are reasoning rather than evidence, and neither is published guidance.

The dependency question, put fairly

Red Nose raises it without alarm: babies can get used to any settling technique and may only settle with these.

That is true of white noise, of rocking, of a dummy, of feeding to sleep and of a particular sleeping bag. It is worth knowing before you make white noise a fixed part of every sleep, because it becomes something you have to take on holiday and reproduce in a strange room.

It is not a safety issue and it is not a reason to avoid it. It is a reason to be relaxed about whether it happens every night.

What it does not replace

Red Nose's six safe sleep recommendations are the frame everything else hangs on: always place baby on their back to sleep; keep baby's head and face uncovered; keep baby smoke free before and after birth; provide a safe sleeping environment night and day, with a safe cot, safe mattress and safe bedding; sleep baby in their own safe sleeping place in the same room as their parent or caregiver for at least the first six months; and breastfeed baby if possible.

White noise appears nowhere on that list, and correctly so. It is a settling aid with modest evidence and no known risks. That is all it claims to be.

Where guidance differs

Only Australia has published a position. Red Nose has reviewed the evidence and concluded there are no known risks. The Lullaby Trust, the NHS and the HSE do not address white noise directly, which is neither an endorsement nor a warning.

Nobody publishes a volume limit for home use. If you see a specific decibel figure quoted as official guidance for a nursery, check where it comes from – it is not in the safer sleep advice of any of these bodies.

No safe sleep body endorses a product. Red Nose states explicitly that it does not endorse specific settling techniques. A sound machine marketed with a safety claim, or with a safe sleep charity's name attached, deserves the same scepticism as any other product in this category.