Brown Noise for Babies: Safe Volume, Distance and Timing

Brown noise can be a gentle way to help a baby settle, as long as you keep it quiet, far from the crib and on for no longer than needed. Research has found that some infant sound machines can get loud enough to be a concern for young ears, so the color of the noise matters much less than how you use it.

This article is general information, not medical advice. Your pediatrician knows your baby and is the right person to ask about sleep or hearing.

Why parents reach for steady sound

Babies spend months in a surprisingly noisy place: the womb is full of muffled heartbeat, blood flow and digestion. It is a common belief that a steady “shushing” sound feels familiar and calming to newborns, and many parents find it helps.

There is a little research behind the idea, though not much. In a small 1990 randomised trial of 40 newborns aged 2 to 7 days, 16 of the 20 babies who heard white noise (80%) fell asleep within five minutes, compared with 5 of the 20 (25%) in the control group. The authors concluded that white noise “may help” parents settle difficult babies. It is a single, decades-old study with a tiny sample, so treat it as encouraging rather than conclusive.

Steady sound also does something useful for any sleeper: it softens sudden noises, like a door, a dog or a sibling, so they stand out less against a quiet room. Our guide to brown noise for sleep explains that masking effect in more detail.

Brown, white or pink for a baby?

No study has compared noise colors for infants, so there is no “best” one. The difference is mostly about character:

Noise	How it sounds	Why a parent might pick it
White	Bright, even hiss	The classic “shush”; the only color studied in newborns
Pink	Softer, like steady rain	A middle ground if white feels harsh
Brown	Deep, low rumble	Sounds gentle, so it can feel less intrusive at a low volume

Brown noise puts most of its energy into low frequencies, which many adults find warmer and less fatiguing than white noise. That can make it easier to keep at a modest level. For the full comparison, see brown noise vs. white noise.

The real issue: volume

The most useful research on this topic is not about color at all. A 2014 study in Pediatrics measured 14 infant sleep machines at maximum volume, at distances of 30, 100 and 200 cm, adjusting for the ear canal of a 6-month-old.

What it found:

• At 30 cm, every machine exceeded 50 dBA, which the authors describe as the current recommended noise limit for infants in hospital nurseries.
• Three machines went above 85 dBA. Played at that level for more than 8 hours, they would exceed adult workplace limits for accumulated noise exposure.
• The authors concluded that these devices are capable of producing sound levels that may be damaging to infant hearing and auditory development.

For context, the US National Institute on Deafness and Other Communication Disorders notes that sounds at or below 70 dBA are unlikely to cause hearing loss even after long exposure, while long or repeated exposure at or above 85 dBA can. Normal conversation sits at around 60 to 70 dBA. The WHO’s safe listening guidance makes the same point: risk depends on both how loud a sound is and how long you hear it.

Babies cannot move away from a sound or tell you it is too loud, so the cautious approach is to aim well below those thresholds.

How to use brown noise safely with a baby

A simple routine covers most of the risk:

1. Start at the lowest volume. Turn it up only until it softens household noise. Never use a speaker or machine at its maximum.
2. Check it at the crib. Stand where your baby’s head will be. The sound should be softer than a normal speaking voice. If you have to raise your voice over it, it is too loud.
3. Put distance between the speaker and your baby. Place it across the room if you can. Sound drops off with distance, so this is one of the easiest ways to lower exposure.
4. Keep devices out of the sleep space. No phone, speaker or machine in the crib, on the mattress or attached to the rails.
5. Limit how long it runs. Use sound to help your baby fall asleep, then let a timer fade it out, rather than running it loudly all night.
6. Re-check as things change. A new room, a new speaker or an app update can all change the real volume.

If you use the Brown Noise app, the fade-out sleep timer suits this well: it lowers the sound gradually instead of cutting off with a jolt. You can preview Brown Noise, Rain on Roof or Ocean Beach in the free web player to find one that sounds gentle at a low level. If your phone is the speaker, it belongs on a shelf or dresser, never in or next to the crib.

Sound fits inside safe-sleep advice, not instead of it

A sound machine or app is a comfort tool. It does nothing to make sleep safer, and it should never take attention away from the basics. The American Academy of Pediatrics’ 2022 safe sleep recommendations include:

• placing your baby on their back for every sleep
• a firm, flat, non-inclined sleep surface
• sharing a room, but not a bed
• keeping soft bedding and objects out of the sleep area, and avoiding overheating

The AAP’s parent site, HealthyChildren.org, has a clear parent’s guide to safe sleep that is worth reading in full. Keeping cords, speakers and phones out of the crib follows naturally from the “nothing in the sleep space” rule.

Will my baby get used to needing it?

Some babies do come to associate the sound with sleep, the same way they might with a dark room or a bedtime song. That is a sleep cue, not a harmful dependence. If you want to wean off it, lowering the volume a little every few nights is a gentle way to do it.

It also helps to keep sound as one part of a routine rather than the whole routine. A consistent bath, feed and wind-down matter at least as much.

When to talk to your pediatrician

Sound is not a fix for every sleep problem, and it should not cover up something that needs attention. Check in with your pediatrician if your baby:

• has trouble sleeping that does not improve with a steady routine
• seems unusually unsettled, feeds poorly or has breathing pauses or noisy breathing in sleep
• does not react to loud sounds or your voice, or you have any concern about their hearing

The bottom line

Brown noise may help some babies settle, and its soft, low character makes it a pleasant option for many parents. The evidence on noise and infant sleep is thin, but the evidence on volume is clear enough to act on: keep it quiet, keep it far from the crib, keep devices out of the sleep space and let a timer fade it out. For general listening guidance for the rest of the family, see is brown noise safe?.