Is white noise safe for babies?

White noise can be used around a baby, but it should not be treated as risk-free. The important factors are the sound level where your baby is, how close the source is and how long it plays. A volume button or percentage does not tell you the exposure reaching the cot.

Some research suggests white noise may help some babies in some circumstances, while other outcomes have not improved. Tests have also found that some devices can produce concerning sound levels at high output, but those tests measured sound rather than injury. They do not prove that ordinary, cautious home use causes hearing or developmental harm.

To use it more cautiously, avoid maximum output, keep the source and any lead outside the cot and out of reach, and favour short use. Do not let white noise delay attention to signs that your baby may be unwell, and keep following NHS safer-sleep advice for every sleep.

Why sound level, distance and time all matter

Sound exposure is not determined by the type of device alone. The American Academy of Pediatrics describes noise dose in terms of duration as well as volume, while NHS paediatric audiology guidance also stresses that time exposed matters.

Think about the sound reaching your baby

Laboratory studies of infant sleep machines found that measured sound changed with both the device setting and the measurement distance. The results varied between products too. This is why a label such as “low”, or a percentage on an app or speaker, cannot by itself show what is reaching your baby.

Distance matters because sound at the baby's position is the relevant exposure, not sound beside the source. Duration matters because a quieter sound played for longer is a different exposure from a brief sound. These factors work together, so changing only one does not provide a guarantee.

Why a phone app is not proof of safety

A phone app may display a number, but it should not be treated as a precise infant-safety check. The phone, microphone, app, room and measurement position can all differ. Measuring beside the speaker would not tell you what reaches the baby either.

If an audiologist or another clinician has advised you to monitor sound in a particular way, follow their individual instructions. General online guidance should not replace that advice.

What the evidence can and cannot say about harm

Two laboratory studies found that some devices could produce potentially concerning sound levels at maximum output: one examined 14 infant sleep machines and another tested machines and phone apps. These findings justify caution about high output, close placement and prolonged exposure.

However, the studies measured sound output, not hearing injury in babies. A 2024 scoping review also found that the best intensity and duration for children remain unknown. The evidence supports neither “completely harmless” reassurance nor a claim that ordinary cautious use is proven to cause hearing, speech, language, learning or neurological damage.

How to use white noise more cautiously

Use the three exposure questions together: how loud is it where your baby is, how close is the source, and how long will it play? Then turn them into a setup that keeps both sound and physical hazards in mind.

Keep the device and any lead outside the cot and out of reach; no single distance guarantees safety.

•Avoid maximum output.

•Put the source as far from your baby's head as practicable.

•Keep the source outside the cot or sleep space and out of reach.

•Keep any power lead outside the cot and completely out of reach.

•Favour short use; there is no evidence-backed universal timer.

•Follow NHS safer-sleep advice for every sleep.

Placement and cable safety

Keeping the source further from your baby's head is a cautious sound-exposure principle, not a fixed-distance guarantee. Place it on a stable surface outside the cot or sleep space. Do not put a machine, speaker or phone in the cot.

Cable safety is a separate physical hazard. Public Health Agency guidance warns that a monitor lead within reach of a cot or bed can cause strangulation. Apply the same out-of-reach rule to any powered sound source.

White noise does not make another sleep setup safer. Follow NHS safer-sleep advice for every sleep, including putting your baby on their back on a firm, flat mattress and keeping the cot clear.

Can white noise stay on all night?

The American Academy of Pediatrics advises using an infant sleep machine for only a short time. A 2024 scoping review found that the best duration for children remains unknown, and continuous all-night use has not been established as safe. That uncertainty is not proof that one night of ordinary use has caused harm, but it is a reason not to promise that leaving it on all night is risk-free.

Use white noise for a short time because continuous all-night safety has not been established.

There is no evidence-backed number of minutes or hours that suits every baby, device and room. If white noise is part of settling, consider switching it off rather than relying on an unsupported universal timer.

When to ask for health advice or urgent help

White noise cannot diagnose or treat a hearing, sleep or health concern. Do not increase the volume or wait for the sound to settle your baby when you would otherwise seek advice.

Hearing or response-to-sound concerns

If you are concerned about your baby's hearing or how they respond to sound, contact your health visitor or GP. The NHS newborn hearing screen does not detect every type of hearing loss, and hearing can change later.

This does not mean white noise caused the concern. Do not use a home sound-response check as a pass-or-fail hearing test.

Persistent sleep problems

Babies have individual sleep and waking patterns. If your baby is having persistent sleep problems, or you need more advice about their sleep, speak to your health visitor, as advised in the NHS baby sleep guidance. Increasing or continuing white noise is not a treatment for a sleep disorder.

These routes follow current NHS safer-sleep and serious-illness guidance. Individual audiology, neonatal or other clinical advice takes priority over general sound guidance.

What the evidence says about sleep benefits and stopping

White noise may help some babies in some circumstances, but it is not a guaranteed sleep aid. A 2025 systematic review and meta-analysis found improvements in some outcomes for infants and young children, while other sleep outcomes did not improve. The studies varied and had methodological limitations.

An earlier systematic review of noise as a sleep aid also found results ranging from improvement to disruption and rated the evidence for continuous noise improving sleep as very uncertain. Possible benefit should not be used to justify louder, closer or all-night exposure.

Sleep cues, reducing use and when to stop

A familiar sound may become one part of a bedtime routine. That is not the same as proving physiological dependence or addiction, and there is no evidence-backed age when every family must stop using white noise.

If you want to reduce it, you could lower or shorten its use gradually as a practical family choice, not as a clinically proven weaning method. If sleep problems persist, speak to your health visitor rather than assuming your baby needs more white noise.

FAQs about white noise for babies