Quick Answer
If you use white noise, keep it quiet, place the device well away from your baby's sleep space, and limit how long it runs. Use the lowest useful setting rather than turning it up to drown out every sound.
A commonly used conservative reference is no more than about 50 decibels at the baby's sleep position, not at the machine. This is not a guaranteed safe limit for every duration or device. Quieter and shorter exposure is preferable, and white noise is optional.
Why Does Volume Matter?
Sound exposure depends on loudness, distance, and duration. Some infant sound machines can produce high levels, especially at maximum volume or close to a baby's head.
A product marketed for babies is not automatically safe at every setting. Avoid using adult workplace noise limits as a target for infant sleep; those limits are not recommendations for a baby's overnight exposure.
Where Should I Put the Machine?
Place it as far from the sleep space as practical, ideally at least about 2 metres (roughly 6½ feet) away. Distance alone does not establish safety, so keep the volume low too.
Never put a sound machine, phone, speaker, or wired device inside the crib or attach it where your baby can reach it. Keep cords and chargers safely away, remembering that reaching skills change as babies grow.
If you move the crib or machine, check the setup again. Sound levels at the baby's position may change even when the volume setting stays the same.
How Can I Check the Sound Level?
A suitable sound-level meter can help measure sound near where your baby's head rests. Take the reading with the device at its intended setting and position, checking before your baby is placed in the sleep space. Do not leave measuring equipment in the crib.
Phone apps can give a rough indication, but their readings vary with the phone, microphone, and calibration. Do not treat an app result as proof that a setup is safe.
There is no universal safe percentage setting: 20 percent on one machine can sound very different from 20 percent on another. Room size, other background noise, and the selected sound also matter.
Should It Play All Night?
Continuous sound is not necessary for every baby. Consider a timer or turning the machine off after your baby settles, and avoid running it throughout the day as well as at night.
If you currently use it all night, reduce the volume and duration gradually if that helps your family adjust. Do not turn it louder to maintain sleep or assume that remaining asleep means the sound is harmless.
There is no single well-established volume-and-duration combination that guarantees safety for every infant. Ask your paediatrician or an audiologist for individualized advice if prolonged use is a concern.
Is White Noise Better Than Other Sounds?
White noise may help some babies settle or reduce the contrast between background sounds, but it does not work for everyone. Pink noise, brown noise, rain recordings, and music are not automatically safer simply because they sound softer or are marketed differently.
Choose a steady sound without sudden volume changes if you use one. Be cautious with apps or streaming services that can play advertisements, alerts, or louder tracks. Keep any device outside the sleep space.
Can White Noise Replace Other Sleep Support?
No. A sound machine does not treat hunger, pain, breathing problems, or an unsuitable sleep routine. Respond to your baby's needs rather than increasing volume to cover crying.
It also does not prevent sudden infant death syndrome or make an unsafe sleep surface safe. Continue placing your baby on their back at the start of every sleep on a firm, flat, level infant sleep surface with only a fitted sheet.
Keep pillows, blankets, toys, and positioners out, and stop swaddling at the first signs of attempting to roll. A baby monitor does not replace safe sleep practices.
What Parents Can Try
- Start without white noise if your baby settles comfortably in ordinary household conditions.
- If using it, begin at the lowest setting and keep it well away from the crib.
- Use a timer rather than assuming continuous playback is needed.
- Check the setup whenever you change devices, sounds, or room layout.
- Make sure caregivers use the same low-volume plan.
- Give your baby quiet periods and opportunities to hear normal voices and interaction while awake.
When Should I Seek Help?
Ask your GP, paediatrician, or an audiologist if you are concerned about sound exposure or your baby's response to voices and everyday sounds. Hearing cannot be assessed reliably by whether a baby wakes to a noise.
Seek advice if sleep problems occur with loud habitual snoring, breathing concerns, poor feeding, poor growth, or signs of pain. Do not use louder white noise to mask those symptoms.
Breathing difficulty, blue or grey colouring, or a baby who is hard to wake requires emergency care.
Key Takeaway
White noise is an optional tool, not a sleep requirement. Keep it quiet, far from your baby's head, and limited in duration. A low device setting or reassuring app reading does not guarantee safety, and sound machines never replace responsive care or a safe sleep environment.
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This article is for informational purposes only and does not constitute medical advice. If you have concerns about your baby's health, consult your GP or paediatrician promptly.