White Noise Machine Safety Checklist for Parents

Before you start

• Volume: aim for around 50 dB measured at your baby's ear, not at the machine — about the loudness of a quiet conversation. Details.
• Distance: place the machine at least 2 meters (about 7 feet) from the crib, never on the rail or inside it. Details.
• Duration: prefer a timer or fade-out over playing continuously all night, every night. Details.

Setting expectations

• The evidence that white noise helps sleep is real but limited — treat it as something that may help, not a guaranteed fix. Details.
• A sleep-association dependency is a plausible, generally manageable outcome of nightly use — not a health risk, but worth knowing about.
• Hearing-damage concerns are inferred from occupational noise standards, not documented directly in infants — real enough to justify the volume/distance rules above, not a reason for alarm at moderate settings. Details.

Choosing a sound

• Heartbeat and womb sound have the most specific research backing of the options here, largely from NICU studies. Details.
• White, pink, and brown noise are variations on the same broadband-noise effect at different spectral slopes — no strong evidence one color is definitively "better" for infants. Details.

One general note

None of this replaces guidance from your pediatrician, especially if your baby has a diagnosed hearing condition, was born preterm, or you have any specific medical concern. This checklist reflects general published research, not a personalized recommendation.