White noise is the evidence-backed default; pink and brown noise are gentler-sounding alternatives. White noise is the only color with infant-specific research behind it. Pink and brown noise sound softer and deeper, and some babies settle to them well, but they haven’t been studied in infants. Pick the one your baby calms to at the lowest volume. To go deeper on a single color, see white noise for babies.
This comparison is part of our sleep science section. Comparison last checked: October 2026.
Pink vs white vs brown noise: comparison table
| White noise | Pink noise | Brown noise | |
|---|---|---|---|
| Frequency profile | Equal energy at all frequencies | Energy falls toward high frequencies | Energy falls steeply toward high frequencies |
| How it sounds | Bright, hissy shhh | Softer, fuller, balanced | Deep, low rumble |
| Real-world examples | Untuned radio, air vent, fan | Steady rain, rustling leaves | Waterfall, distant thunder, heavy surf |
| Research in infants | Small trial in newborns (1990) | None specific to infants | None specific to infants |
| May suit | Noisy homes, masking sharp sounds | Babies or parents who find white noise harsh | Babies or parents bothered by hiss, low-pitched noise like traffic |
What does each noise color sound like?
White noise is a steady sound with equal energy across all audible frequencies, which gives it a bright, even hiss. Pink noise has less energy as frequencies rise (about 3 dB less per octave), so it sounds softer and more like steady rain. Brown noise, also called Brownian or red noise, drops off even faster (about 6 dB per octave), so it sounds like a low, rumbling waterfall.
Baby Mantra includes all three colors. Below are previews of white noise plus two natural sounds that are close cousins of the deeper colors: gentle rain, which behaves much like pink noise, and ocean waves, whose heavy surf has a brown-noise rumble.
Real previews from the app. Play them softly.
What does the research say for each color?
For a full look at the infant evidence, see does white noise help babies sleep.
Which is better for babies, pink or brown noise?
Neither has been shown to be better, because neither has been studied in babies. The practical difference is pitch. Pink noise sits in the middle: softer than white noise but still good at covering voices and household sounds. Brown noise is deeper and may feel less harsh to babies who startle at hissy sounds, and it’s good at covering low-frequency noise like traffic or a washing machine.
Read more on each: pink noise for babies and brown noise for babies.
Do babies prefer white or brown noise?
There’s no study that answers this, and individual babies vary. Here’s a simple way to find out for yours:
- Pick one color and use it for 3 to 5 nights at the same point in your routine.
- Keep the volume low, around 50 dB or lower at the crib.
- Watch how your baby settles: time to fall asleep, startles, early wakings.
- Switch colors only after a fair trial, then compare.
If two colors work equally well, choose the one that works at the lower volume.
What about green noise?
Green noise is an informal label for sound concentrated in the middle frequencies, often marketed as “the sound of nature.” Unlike white, pink and brown, it has no standard technical definition, and there’s no infant research on it. If the idea appeals, gentle nature sounds such as rain, wind or a waterfall give a similar effect.
Mixing noise colors with nature sounds
You don’t have to choose just one. Layering a noise color with a natural sound can give you steady masking with a softer texture:
| Mix | Good for |
|---|---|
| White noise + gentle rain | Masking a busy home with a softer edge |
| Pink noise + rain on roof | A cozy, rainy-night feel |
| Brown noise + ocean waves | Deep, slow background for toddlers or city streets |
| Brown noise + waterfall | Covering low traffic rumble |
In Baby Mantra you can play up to three sounds at once and set each volume separately, save a mix you love, and let a timer of 15 minutes to 2 hours fade it out. Explore the Baby Mantra app to see every feature.
Sources
- Spencer JA, Moran DJ, Lee A, Talbert D. White noise and sleep induction. Archives of Disease in Childhood, 1990.
- Riedy SM, Smith MG, Rocha S, Basner M. Noise as a sleep aid: a systematic review. Sleep Medicine Reviews, 2021.
- Ngo HV, Martinetz T, Born J, Mölle M. Auditory closed-loop stimulation of the sleep slow oscillation enhances memory. Neuron, 2013.
- Papalambros NA, Santostasi G, Malkani RG, et al. Acoustic enhancement of sleep slow oscillations and concomitant memory improvement in older adults. Frontiers in Human Neuroscience, 2017.
- Hugh SC, Wolter NE, Propst EJ, et al. Infant sleep machines and hazardous sound pressure levels. Pediatrics, 2014.
