White Noise for Babies: Does It Really Help Your Baby Sleep?

Quick answer: White noise may help some babies settle. In a small 1990 study of 40 newborns, 16 of 20 (80%) fell asleep within five minutes with white noise, compared with 5 of 20 (25%) in the control group. Keep it at or below 50 decibels, place the sound source at least 2 metres from the cot and never inside it, and gradually reduce reliance as your baby grows.

What parents need to know

If you've spent weeks bouncing, rocking and shushing a baby who refuses to sleep, chances are someone has mentioned white noise. But does it work, and is it safe?

What is white noise?

White noise is a consistent, steady sound that contains all frequencies at the same intensity, creating a calming shushing effect. It closely mimics the sounds babies heard in the womb — muffled voices, blood flowing, the constant hum of the outside world. For many babies, these familiar sounds are deeply soothing.

Why does white noise help some babies sleep?

Babies spend nine months in a surprisingly noisy environment — the womb is roughly as loud as a vacuum cleaner. When they arrive in the relative quiet of a bedroom, sudden sounds like a door closing or a dog barking can easily startle them awake. White noise helps by creating a consistent sonic environment that drowns out sudden noises, mimicking the womb, and acting as a sleep association cue that signals it is time to rest.

What does the research say?

A small randomised trial published in the Archives of Disease in Childhood in 1990 (Spencer and colleagues) studied 40 newborns aged 2 to 7 days. Sixteen of the 20 babies who heard white noise (80%) fell asleep within five minutes, compared with five of the 20 babies in the control group (25%). Experts caution that volume matters and it should be used as a helpful tool rather than a permanent solution.

How to use white noise safely

Keep white noise quiet: 50 decibels is the recommended noise limit for babies in hospital nurseries, roughly as loud as a quiet conversation. A 2014 study in the journal Pediatrics found that all 14 infant sleep machines tested were louder than this at 30cm when played at full volume. Key guidelines:

Types of white noise

• Dedicated baby sound machines: Allow precise volume control and multiple sound options
• Apps: Convenient and often free — keep phones well away from the cot
• Fan sounds: Provide gentle background noise and can help regulate room temperature
• Pink or brown noise: Lower-frequency variants some babies prefer, available on most sound apps
• Shushing: The classic parental shush is itself white noise and highly effective for young babies

Is it safe for newborns?

Volume and distance matter. 85 decibels is a workplace noise limit for adults over an 8-hour day, not a guide for babies. Researchers who tested 14 infant sleep machines at full volume found three were louder than 85 decibels, and warned that these machines can produce sound levels that may damage a baby’s hearing. Keep the volume low and the machine on a shelf, away from your baby’s ear and never in the cot.

Alternatives if white noise does not work

Not every baby responds to white noise. Try rainfall, ocean waves, gentle lullabies, heartbeat recordings, or the low hum of a tumble dryer. Combining sound with swaddling your baby in a thin muslin, following safer swaddling guidance, can create that cocooned, womb-like feeling that helps many babies drift off.

Frequently asked questions

Where should I put a white noise machine?

Place the sound source at least 2 metres away from the cot and never inside it. If you are using a phone app, keep the phone well away from the cot.