The "is white noise safe?" question gets answered loudly on the internet — sometimes with reassuring sweep, sometimes with alarm. The truthful answer is more specific than either: white noise at 50–60 dB, two metres from the cot, used continuously through the night, is safe and well-tolerated. White noise at maximum volume on a machine sitting on the cot rail isn't. The numbers actually matter.
Healthbooq gives you the safety details that turn a sleep tool into a safe sleep tool.
The Hearing Risk in Numbers
Infant hearing is developing throughout the first year and is more sensitive to noise damage than adult hearing. The thresholds that matter, from the AAP, NIOSH, and WHO:
- Below 50 dB — completely safe at any duration
- 50–60 dB — safe for sleep environment (comparable to soft shower in next room, quiet conversation, or refrigerator hum)
- 60–70 dB — generally safe but at the upper limit for sustained nightly exposure
- 70–85 dB — measurable cumulative risk over months of exposure
- Above 85 dB — recognised hearing-damage threshold for prolonged exposure
The Hugh and Wunderlich 2014 Pediatrics paper tested 14 commercially-sold infant white noise machines at maximum volume, 30cm from where a baby's head would be. All 14 exceeded the 50 dB nursery limit at that setting. Three exceeded 85 dB. The headline that followed — "white noise machines may damage infant hearing" — was technically true but missed the actual finding: the same machines at the bottom of their volume range, set 2m from the cot, sat comfortably under 60 dB.
Translation: it's not white noise that's the problem. It's loud white noise close to the head.
The Setup That's Actually Safe
Volume around 50–60 dB at the baby's head. This is the level of a quiet conversation, a gentle shower, or a refrigerator. If you can have a normal conversation across the room with white noise running, you're roughly there. If you have to raise your voice, it's too loud.
Verify with a smartphone app, once. Free decibel meter apps (Decibel X, Sound Meter, NIOSH SLM on iOS) are accurate enough for this purpose. Hold the phone at the height the baby's head will be in the cot, and read the dB level. Adjust the machine until it reads 50–60. You only need to do this once for a given setup.
Place the machine at least 2 metres from the cot. Not on the cot rail. Not on the changing unit next to the cot. Across the room is the goal — preferably between the cot and the door, so it covers external noise (corridor, hallway, sibling's bedroom) more effectively.
Never use the max volume setting unless you have specifically verified it sits in the safe range at your distance. Many infant white noise machines have their max setting calibrated for a different use case (e.g., toddler bedrooms with door open, brief soothing) and are not appropriate for a cot environment.
What "Safe Continuous Use" Looks Like
At 50–60 dB across the night, every night, for weeks or months, there is no documented safety concern. White noise running 7pm-to-7am is not the problem. The duration question is mostly a red herring — the issue is volume, not exposure time, when volume is set correctly.
This means it's also fine to use white noise during day naps. Total daily exposure of 14–16 hours at 55 dB does not approach hearing risk thresholds.
Specific Models and Setups
Without endorsing any particular product, the dedicated white noise machines that score well on safe volume range include the Yogasleep Hushh, the LectroFan Classic, the Hatch Rest, and the Marpac DOHM. Most of these have a usable safe-volume setting around 30–50% of maximum.
Avoid: clip-on machines designed to attach to the cot (placement is too close), older machines with no volume gradation, and stuffed-toy white noise plushies that are designed to live in the cot itself.
The Other Common Concern: Dependency
This isn't a safety question — it's a practical one. White noise dependency is real but easy to address (gradual volume reduction over 2–3 weeks) and there's no evidence it harms sleep development long-term. Used at safe volume, it can run indefinitely without consequence.
Key Takeaways
White noise is safe for infants at the right volume and distance — not safe at any setting. Keep it at 50–60 dB measured at your baby's head (about the level of a soft shower in the next room) and the machine 2 metres from the cot. Most commercial machines tested in the 2014 Pediatrics paper exceeded safe limits at max volume close to the cot — that's a setup problem, not a verdict on white noise itself.
