How loud should white noise be for a baby?

Before choosing a number, name the problem: a television through the wall, a door that bangs, or a short period of evening activity. If you can reduce that source directly, try that first. Do not assume the nursery needs a constant added sound simply because a machine is available.

A useful setup note says “fan sound, dresser beside the door, low setting.” “Twenty percent” alone is incomplete: it does not identify the speaker, track, phone volume or position. Keep those details together so another caregiver can reproduce your choice.

Choose a location well away from the baby, with the device and its cord out of reach. A dresser across the room may be an option; a crib rail is a poor place for an electronic device. Inspect the entire cord route, including where spare cable hangs.

Treat a distance quoted on a parenting page as incomplete without its volume setting and measurement position. The number you want to understand is the sound at the baby’s location. A reading taken next to a speaker answers a different question. Do not move the crib into a less suitable sleep arrangement just to accommodate a machine.

Keep the sleep space clear. NIH guidance describes a firm, flat, level infant sleep surface covered only by a fitted sheet. Remove any phone used for a pre-sleep check before putting the baby down. NIH sleep-environment guidance.

The 2014 infant sleep-machine paper used 50 dBA as a hospital-nursery comparison. It did not establish a guaranteed safe home setting. Original study.

Use that distinction when reading product claims. A meter measures sound, not a baby’s hearing. A reading cannot retrospectively diagnose harm or promise that any duration of exposure is harmless. Read our 2014 study explanation for the context behind the widely repeated number.

A target can also become an accidental instruction to increase volume: “It is below the number, so I should turn it up.” There is no reason to make a setup louder solely to reach a number on a chart.

Change one thing, then check again using the same phone position and app settings. If you move the speaker and change the track and volume together, you cannot tell which change mattered. A comparison can be useful without turning your evening into a measurement project.

Choose a meter whose documentation explains its limits. NIOSH publishes testing information for its own iOS app; that validation does not transfer to another app sharing the same phone. NIOSH app documentation. Our iPhone measurement guide explains the workflow.