If you’re a sleep-deprived parent, you’ve probably heard that white noise can help babies sleep. But does it actually work? And is it safe? In this guide, we look at the research, explain why babies respond so strongly to white noise, and help you choose the best baby white noise machine for your nursery.
Why Do Babies Respond to White Noise?
Before birth, babies spend nine months in the womb — an environment that is anything but quiet. The constant whooshing of blood flow through the placenta, the muffled sounds of the outside world, and the rhythmic sounds of the mother’s heartbeat and breathing create a continuous soundscape that registers at around 72–88 decibels. That’s roughly as loud as a vacuum cleaner.
When babies are born, they’re suddenly placed in a comparatively silent world. For many newborns, this silence is actually unsettling — it’s unfamiliar. White noise mimics the sounds of the womb, triggering a calming reflex that helps babies settle, stop crying, and fall asleep more easily.
This is why so many parents find that turning on a fan, running the vacuum cleaner, or playing white noise through a sound machine can calm a crying baby almost instantly.
What Does the Research Say?
The evidence for white noise and infant sleep is promising. A study published in the Archives of Disease in Childhood found that 80% of newborns fell asleep within five minutes when exposed to white noise, compared to just 25% in the control group. Other research has shown that white noise can reduce infant crying, improve sleep onset, and help babies stay asleep longer in noisy environments.
White noise is also widely used in neonatal intensive care units (NICUs) to help premature babies sleep and reduce stress responses to environmental noise.
That said, it’s important to use white noise correctly — volume and placement matter significantly for safety.
Is White Noise Safe for Babies?
Yes — when used correctly. The key safety guidelines are:
- Volume: Keep the sound machine at or below 50 decibels at the baby’s ear level. This is roughly the volume of a quiet conversation. Avoid placing the machine directly next to the cot.
- Distance: Position the machine at least one metre (ideally two metres) away from the baby’s sleeping area.
- Duration: It’s fine to run white noise all night. Many parents use it continuously as part of a sleep routine.
- Sound type: Steady, consistent white noise is preferable to sounds with sudden changes in volume or pitch.
The American Academy of Pediatrics (AAP) recommends keeping infant sleep environment noise below 50 decibels. Most dedicated baby white noise machines are designed with this in mind and include volume controls to help parents stay within safe limits.
White Noise vs Other Baby Sleep Sounds
Not all sleep sounds are equal for babies. Here’s how the main options compare:
- White noise — the most researched option; closely mimics womb sounds; best for newborns and young infants
- Pink noise — slightly softer than white noise; some parents prefer it for older babies
- Brown noise — deeper and more bass-heavy; less womb-like but some babies respond well to it
- Lullabies and music — can help with sleep onset but may cause babies to wake when the music stops; less effective for sustained sleep
- Heartbeat sounds — particularly effective for newborns; mimics the sound heard in the womb
- Nature sounds — rain, ocean, and similar sounds can work well for older babies and toddlers
For newborns, white noise or heartbeat sounds are generally the most effective. As babies get older, you have more flexibility to experiment with different sounds.
How to Use a White Noise Machine for Your Baby
Getting the most out of a baby white noise machine is straightforward:
- Start early: Introduce white noise from birth to establish it as a sleep cue
- Use it consistently: Play white noise for every sleep — naps and night sleep — so your baby associates it with sleep time
- Keep the volume safe: Aim for 50 decibels or below at the baby’s ear level
- Position it correctly: Place the machine at least one metre from the cot, not directly next to the baby’s head
- Use it as part of a routine: Combine white noise with other sleep cues like dimming lights and a consistent bedtime routine for best results
- Don’t stress about weaning: Many children use white noise well into toddlerhood and beyond without any issues
What to Look for in a Baby White Noise Machine
When choosing a sound machine for your nursery, look for:
- Volume control — essential for keeping sound levels safe
- Multiple sound options — white noise, heartbeat, lullabies, and nature sounds give you flexibility as your baby grows
- Timer function — useful if you want the sound to turn off after your baby is settled
- Portability — a portable, rechargeable option is ideal for travel, prams, and cots away from home
- Nightlight — a soft nightlight is handy for night feeds without fully waking the room
- Loop clip — for attaching to prams and cots on the go
Our Recommendations for Baby White Noise Machines
Our Serenity Portable White Noise Machine is an excellent all-rounder for nursery use — it offers 24 sounds including white noise and heartbeat, a soft nightlight, a rechargeable battery, and a loop clip for prams and cots. It’s compact, safe, and designed for exactly this purpose.
For a portable option that travels easily, the Hushh Portable White Noise Machine by Yogasleep is a favourite among Australian parents — small enough to clip to a pram or hang in a cot, with three sound options and a child lock.
Browse our full range of white noise machines to find the right option for your nursery.
Frequently Asked Questions
At what age can I start using white noise for my baby?
You can start using white noise from birth. Many parents introduce it in the first few days at home. It’s particularly effective for newborns because it closely mimics the sounds of the womb.
Can white noise harm my baby’s hearing?
White noise is safe for babies when used at appropriate volumes. Keep the machine at or below 50 decibels at the baby’s ear level and position it at least one metre from the cot. Avoid placing the machine directly next to your baby’s head.
Should I leave white noise on all night for my baby?
Yes, it’s fine to run white noise all night. Continuous white noise can actually be more effective than using a timer, as it prevents babies from waking when the sound stops. Many families use white noise all night for years without any issues.
Will my baby become dependent on white noise to sleep?
Some babies do become accustomed to sleeping with white noise, but this is generally not a problem. White noise is a safe, non-pharmacological sleep aid. If you want to wean your baby off it eventually, you can gradually reduce the volume over time.
What volume should a baby's white noise machine be set to?
Keep the volume at or below 50 decibels at the baby’s ear level. If you don’t have a decibel meter, a good rule of thumb is that the white noise should be audible but not so loud that you need to raise your voice to speak over it in the same room.
Can I use a white noise app instead of a machine?
You can, but a dedicated white noise machine is generally preferable for nursery use. Machines are designed to run continuously without interruption, don’t require a phone or tablet to be in the room, and often have better volume control and sound quality than app-based alternatives.
