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White noise is often sold as a shortcut to better baby sleep. Some families find a steady background sound useful when settling their baby, but the evidence does not justify promising longer nights or uninterrupted sleep. A sound machine is an optional extra, and volume and placement matter.
What does the research actually show?
A frequently quoted 1990 trial of white noise and sleep involved just 40 newborns aged two to seven days. Sixteen of the 20 babies exposed to white noise fell asleep within five minutes, compared with five of the 20 in the control group.
That is a finding about settling over a very short period in a small group of newborns. It does not establish that white noise keeps older babies asleep all night, improves long-term sleep or works for every child. Describing it as “three times better sleep” turns a narrow result into a much broader claim.
When comparing products, separate what a device does from what its advertising promises. A timer and volume control are features you can inspect. A promise of a full night’s sleep is a claim that would need much stronger evidence.
How to use a sound machine cautiously
The American Academy of Pediatrics warns that some infant sleep machines can produce hazardous sound levels. Its advice is to place the device as far from the baby’s head as possible and use it for a short time.
- Keep the volume low rather than turning it up to cover every household sound.
- Keep the device and its cable outside the cot and out of your child’s reach.
- Use a timer or switch it off after a short settling period, rather than assuming it should run all night.
- Do not treat a fixed distance such as “two to three feet” as a guarantee of safety: output varies between devices and settings.
If it does not seem helpful, you do not need to persist or buy a different machine. Ask your health visitor for advice if settling or waking is becoming difficult to manage.
Keep safer sleep at the centre of the routine
Sound does not make a sleeping space safe
Follow the Lullaby Trust’s guidance: place your baby on their back in a clear, flat, firm sleeping space, in your room for at least the first six months.
The NHS notes that a home need not be silent while a baby sleeps. Ordinary daytime sounds and a quieter night-time routine are enough; white noise is not a requirement for healthy sleep.
Information checked: 19 October 2026. The research described above concerns short-term settling, not a proven solution to night waking.
