Guides
Every claim on hushnap is sourced. These guides go deeper on the research behind the volume, distance, and timer guidance in the player, and the evidence for each sound.
Is White Noise Safe for Babies? What the Research Says
An overview of what's actually established, what's contested, and what safe use looks like.
How Loud Should a Baby Sound Machine Be? The 50 dB Rule, Explained
The AAP-published research behind the 50 dB target — and why it means at the ear, not at the machine.
White Noise vs. Pink Noise vs. Brown Noise: What's the Difference?
The actual DSP definitions behind each noise color, and what (if anything) the research says about which helps sleep.
Best Sounds for Newborn Sleep, Ranked by the Evidence
Heartbeat, womb sound, shushing, broadband noise — which have real study backing and which are just popular.
How Far Should a Sound Machine Be From the Crib?
Distance and loudness fall off together — what the source study actually tested.
Should You Run White Noise All Night? Timers and Fade-Outs
What general noise-exposure guidance suggests about duration, and why we default to a timer.
Does White Noise Actually Help Babies Fall Asleep Faster?
The founding 1990 sleep-onset study, a 2025 meta-analysis, and why the evidence is real but limited.
Heartbeat and Womb Sounds for Infants: What Studies Show
Why these two sounds have some of the strongest (if narrow) research backing of any infant sound.
Can White Noise Cause Hearing Damage in Babies? Fact vs. Fear
What's inferred from occupational noise standards and animal studies — and what isn't proven.
White Noise Machine Safety Checklist for Parents
A short, sourced checklist pulling every guideline on this site into one place.
White Noise for Naps vs. Nighttime Sleep: Does It Matter?
What changes (and what doesn't) about safe use between a daytime nap and an overnight sleep.