How long should you play white noise for a baby?
General information, not medical advice. Talk to your paediatrician about your baby’s sleep and hearing.
There is no official “correct” duration for baby white noise, and research on it is limited. What the main cautionary sources agree on is that it does not need to play continuously: Children's National Hospital suggests turning the machine off once the baby is asleep, or using a timer. Here is a practical way to think about it.
A simple starting point
| Situation | Timer to try |
|---|---|
| Nap | 30–45 minutes, or until the nap is well under way |
| Bedtime | 45–60 minutes with a slow fade-out |
| Night wake-up | Restart the same sound at the same low volume for 20–30 minutes |
These are starting points, not rules. Adjust to what works for your baby and your household, and keep the volume low and the speaker far from the crib regardless of the timer.
Why fade out instead of cutting off
A sound that stops abruptly can itself be a wake-up cue for a light sleeper. A fade of 30 seconds to a few minutes removes the sharp edge. Dozefan's timer fades out smoothly and, if the baby stirs, you can bring the same sound back with one tap.
Signs to reconsider
- Your baby only sleeps when the sound is playing at a high volume — turn it down gradually (see how to wean off).
- The device is close to the crib — move it away.
- You are unsure whether the level is safe — check with a decibel app at the baby's head height, aiming near 50 dB, or use the calculator.
A quick safe-sleep reminder
Sound does not replace safe sleep. Always place your baby on their back, on a firm, flat sleep surface, in an empty crib or bassinet — no pillows, blankets, bumpers or soft toys (see the AAP safe-sleep guidance). If your baby has trouble sleeping, you have hearing concerns, or anything else worries you, talk to your paediatrician.
Sources
- Children's National Hospital — Baby sound machines and hearing loss
- Hugh SC, Wolter NE, Propst EJ, et al. “Infant sleep machines and hazardous sound pressure levels.” Pediatrics, 2014 (abstract summary, McMaster University)