White Noise for Babies: Safe Volume, Distance, and Setup
White noise settles newborns because it sounds like the womb, which was louder than most nurseries. The safety rules are simple and worth getting exactly right.
Last updated: July 11, 2026
Short answer: keep the volume at or below 50 decibels (a quiet conversation), place the phone or speaker at least 7 feet (2 meters) from the crib, use a timer or lower the volume after the baby settles, and never put the device in the crib. With those rules met, white noise is a safe, effective sleep aid for infants.
Why white noise works on newborns
The womb is not quiet. Blood flow, heartbeat, and digestion produce a constant whoosh that researchers estimate at 70–90 decibels — louder than a vacuum cleaner heard from across a room. A silent nursery is the alien environment; steady noise is home. That is why the classic parent tricks are the hair dryer and the vacuum: rhythmic, unbroken, womb-like.
Steady sound also masks household noise — dishes, older siblings, the doorbell — that would otherwise cut naps short.
The safety rules, precisely
- 50 dB maximum at the baby's head. That is roughly a quiet conversation or a running refrigerator. Measure with a free decibel meter app placed where the baby's head rests.
- 7 feet (2 meters) minimum distance. The sound source stays well away from the crib, and never inside it or attached to the rail.
- Timer over all-night loud play. Set a fade-out for 30–60 minutes once the baby has settled, or lower the volume for the rest of the night.
- Start low. Set the volume before the baby is in the room. Resist matching a crying baby's volume; the sound should soothe under the crying, not compete with it.
Which sounds settle babies fastest
Steady and rhythmic beats melodic. In DRMN, parents reach for:
- White noise — the default, closest to generic womb sound
- Hair dryer — the classic, now without running an actual hair dryer
- Vacuum cleaner — deeper hum for babies who prefer low frequencies
- Gentle static — softer texture for light-sleeping infants
Setting up a phone as a baby sound machine
- Download Sound Machine Deep Sleep DRMN free from the App Store — an old or spare phone works well as a dedicated nursery device.
- Pick White Noise, Hair Dryer, or Vacuum Cleaner from the library.
- Place the phone at least 7 feet from the crib, out of reach, and enable Do Not Disturb so notifications never interrupt playback.
- Set the volume, then verify it reads 50 dB or lower at the crib with a decibel meter app.
- Set the fade-out timer for 30–60 minutes, or run it low all night during sleep regressions and travel.
Frequently asked questions
Is white noise safe for babies?
Yes, within pediatric limits: 50 dB or below at the baby's head, sound source at least 7 feet away, timer or reduced volume after settling, device never in the crib.
What sounds work best for newborn sleep?
Womb-like, rhythmic sounds: white noise, hair dryer, vacuum hum, gentle static. All four are in DRMN's library.
Do I need a dedicated baby sound machine?
No. A phone running DRMN, placed correctly and volume-checked, does the same job — and a spare phone makes a permanent nursery device.