Safe volume for baby white noise: how loud, how far, how long
General information, not medical advice. Ask your paediatrician about sound and sleep for your child.
Steady sound — a fan, a hair dryer, white noise — helps many parents settle a baby. The catch: babies' ears are small, and sound machines can be surprisingly loud. Here is what the research says and a simple routine that keeps the volume sensible.
What the research found
A 2014 study in Pediatrics (Hugh and colleagues) measured 14 infant sleep machines. At maximum volume and 30 cm distance, all of them exceeded 50 A-weighted decibels — the noise limit recommended for hospital nurseries — and three exceeded 85 dBA, a level that would be a concern for adults after about eight hours. The authors concluded that the machines can produce sound levels that may harm infant hearing and auditory development, and suggested using them more cautiously.
Children's hospitals give similar practical advice: keep infant sound machines below roughly 50 dB (about the level of a soft conversation), place them away from the crib, and use a timer rather than playing sound all night.
The three-part routine: quiet, far, short
- Quiet. Aim for about the loudness of a quiet conversation at the baby's head. Test by standing where the baby sleeps: you should be able to talk normally over it without raising your voice.
- Far. Distance is the easiest safety margin — sound drops quickly as you move away. We suggest at least 2 m (7 ft) between the speaker and the crib, and never inside the crib or attached to it.
- Short. Use a sleep timer with a gentle fade-out instead of leaving sound on all night. Dozefan's timer fades the sound smoothly so the end of the sound doesn't wake anyone.
Why phone volume is tricky
Two apps at the same slider position can be very different in loudness: a brown-noise track is mostly low frequencies and sounds quieter than white noise at the same level, and every speaker is different. That's why Dozefan loudness-matches all of its 24 sounds to the same target level, so switching sounds doesn't change the volume you set.
How Dozefan helps
- Safe-volume indicator. A simple Quiet / Moderate / Loud estimate based on the sound and your device volume. It's deliberately not a dB number — the real level depends on the speaker and the distance — but it warns you when you've drifted too high.
- Sleep timer with fade-out. 15 minutes to all night, with a gentle tail (Pro lets you pick 30 seconds to 5 minutes).
- Play on another speaker. Send the sound to a HomePod, AirPlay or Bluetooth speaker so the phone can stay out of the room.
- No sudden changes. No ads, no jingles, no popping when a sound starts or loops.
Sources
- Hugh SC, Wolter NE, Propst EJ, et al. “Infant sleep machines and hazardous sound pressure levels.” Pediatrics, 2014. Abstract summary (McMaster University)
- Children's National Hospital, Baby sound machines and hearing loss