Baby sleep
Does white noise help babies sleep? What the research says
Parents swear by it, and some studies are encouraging. But the research is small, old in places, and mixed. Here is what we know and what we do not.
Some research suggests white noise can help babies fall asleep faster, and many parents find it useful. But the evidence is limited and low quality, and some studies have raised concerns about volume. White noise is a reasonable tool to try if it is played quietly and from a distance.
The study everyone quotes
In 1990, researchers (Spencer and colleagues) played white noise to 20 newborns in a hospital nursery and compared them with newborns who were not played the sound. About 80 percent of the babies with white noise fell asleep within five minutes, against about 25 percent of the others. It was a small study and it measured only falling asleep, not how long babies slept or how they developed. Still, it remains the most-cited evidence.
What later reviews found
A systematic review of noise as a sleep aid, published in Sleep Medicine Reviews, looked at studies in both babies and adults. It concluded that the overall quality of the evidence is low and the results are mixed: some studies showed benefits, others showed none. In other words, the honest answer is "it helps some people, and the science is not settled".
The case for it
- It masks sudden noises such as doors, barking and siblings, which are a common cause of waking.
- A steady sound may be easier for a baby to settle into than a quiet, unpredictable room.
- Many babies spent months with constant sound before birth. See why babies are calmed by white noise.
- It becomes a cue that it is time to sleep.
The case for caution
The concern is not the idea but the loudness. In a 2014 study in Pediatrics, researchers tested 14 infant sound machines and found that at maximum volume every machine could exceed 50 decibels, the limit recommended for hospital nurseries, and some were loud enough to be a concern for hearing if used at close range for hours. They advised keeping machines far from the crib, at low volume and not running all night. Separately, animal studies in rat pups exposed to continuous loud noise showed changes in auditory development. This has not been shown in babies, but it is a reason to keep the volume low and not to overdo it.
See white noise safety and how loud is too loud for practical steps.
What it can and cannot do
- It can help a baby settle, cover noise and become part of a bedtime routine.
- It cannot fix hunger, discomfort, illness, or a schedule that does not fit your baby.
- It is not a replacement for safe sleep practice: baby on their back, on a firm flat surface, with a clear sleep space.
What this means for you
If your baby has trouble settling or wakes at every noise, white noise is a low-cost thing to try. Keep it quiet, keep it away from the crib, and watch whether your baby actually sleeps better. If it makes no difference, you can stop. If you have concerns about your baby's sleep or hearing, talk to your pediatrician.
Sources and further reading
- Spencer JA, Moran DJ, Lee A, Talbert D. White noise and sleep induction. Archives of Disease in Childhood, 1990.
- Hugh SC et al. Infant sleep machines and hazardous sound pressure levels. Pediatrics, 2014.
- Riedy SM, Smith MG, Rocha S, Basner M. Noise as a sleep aid: a systematic review. Sleep Medicine Reviews.
- American Academy of Pediatrics, HealthyChildren.org, guidance on safe sleep and noise.
Frequently asked questions
Is there scientific proof that white noise helps babies sleep?
There is some supportive evidence, such as a small 1990 study of newborns, but overall the evidence is limited, low quality and mixed.
Can white noise be bad for babies?
It can be if it is too loud or played too close for long periods. Keeping the volume low and the source across the room reduces the risk.
Does white noise affect language development?
There is no good evidence that quiet white noise harms language development in babies. Animal studies with loud continuous noise are a reason for caution about volume, not proof of harm.
This page is general information, not medical advice. Talk to your pediatrician about your baby's sleep and hearing, and follow current safe sleep guidance.