An iPhone makes a surprisingly good sound machine. With the right white noise app for babies, it plays steady sound offline, fades out on a timer and comes with you wherever your baby naps. The catch is setup: a phone is only a good sound machine when it is quiet, silenced and kept away from the crib. This page covers both. For the basics, see our guide to white noise for babies.
Real previews from the app. Play them softly.
Can I use my phone as a white noise machine for my baby?
Yes. A phone can do the core job of a sound machine, which is playing a steady, low sound that masks sudden household noises and becomes a familiar sleep cue. A good app adds things a basic machine can’t:
- Portability. The same sound at home, on naps out, at the grandparents’ and in a hotel cot.
- Offline play. No Wi-Fi needed, so no buffering, and no ads popping up mid-nap.
- A timer that fades out, so sound can stop gently once your baby is asleep.
- Lock-screen controls, so you can stop or adjust it without unlocking a bright screen.
- More sounds, and mixing. Rain with brown noise, womb sounds with a heartbeat.
The main downsides are that the phone is tied up during sleep and its speaker is small. For many families that is a fair trade, especially for travel.
How to set up your iPhone as a baby sound machine
- Silence calls and alerts. Turn on Do Not Disturb or a Sleep Focus, or use Airplane Mode if you don’t need the phone. Baby Mantra keeps playing offline.
- Plug it in. All-night playback uses battery. Route the cable well away from the crib.
- Place it across the room. Aim for about 2 m (7 ft) from the crib, on a stable surface, never in the crib or bassinet.
- Start low. Set the volume to the softest level that covers household noise, around 50 dB or lower at your baby’s ear.
- Choose a timer or all night. Use 15 minutes to 2 hours with a fade-out, or all night at a low level if your home is noisy.
- Dim the screen. Turn on night mode, or lock the phone and use lock-screen controls.
iPhone Background Sounds vs a white noise app
Apple’s built-in Background Sounds (Settings > Accessibility > Audio & Visual) plays steady noise, rain, ocean and stream sounds on iOS 15 and later. Apple notes that from iOS 26 you can add a timer. It is free and a perfectly good starting point. Here is how it compares:
| iPhone Background Sounds | Baby Mantra | |
|---|---|---|
| Price | Free, built in | Free to start; Premium optional |
| Sounds | A small set of noise and nature sounds | 27 sounds, including womb, heartbeat, shushing and lullaby music |
| Mixing | One sound at a time | Up to 3 sounds, each with its own volume |
| Timer | Timer in iOS 26 and later | 15 min–2 h with gentle fade-out, or all night |
| Spoken affirmations | No | 84, in 7 themes |
| Your own voice | No | Record lullabies and messages, kept on your phone |
| Baby-focused collections | No | First Night, Ocean Embrace, Moonlit Lullaby and more |
If plain noise is all you need, Background Sounds may be enough. If you want a richer bedtime ritual, an app built for babies does more.
What Baby Mantra adds on iPhone
Baby Mantra was designed for the 9 p.m. and 3 a.m. version of you: one hand free, eyes half open.
- 27 sounds, from white, pink and brown noise to rain, ocean, womb sounds and a music box.
- Mix up to three and set each volume separately, which makes it easy to keep the total level soft.
- 84 spoken affirmations that play gently over your sounds.
- Your voice: record a lullaby or a goodnight message for babysitter nights.
- Sleep timer from 15 minutes to 2 hours with a fade-out, or all night.
- Dim night mode and lock-screen controls.
- Bedtime reminders, favorites and saved mixes.
- Offline, no account, no ads. It requires iOS 15 or later, and is iPhone only for now.
See every feature in the full Baby Mantra app tour, or check exactly what’s free in the app.
Is it safe to put a phone near a baby?
Keep it near, but not too near. The phone belongs out of the crib and out of reach, ideally about 2 m (7 ft) away, with its cable secured. Distance matters for sound, too: a study of infant sleep machines found that at maximum volume and close to the crib, all of the machines tested were louder than the limit recommended for hospital nurseries (Hugh et al., 2014). The same logic applies to a phone. The AAP’s safe sleep recommendations also call for a crib with nothing in it but a fitted sheet, so the phone never goes inside.
For the full picture, read how loud white noise should be for a baby.
Sources
- Hugh SC, Wolter NE, Propst EJ, et al. Infant sleep machines and hazardous sound pressure levels. Pediatrics, 2014.
- American Academy of Pediatrics. Sleep-Related Infant Deaths: Updated 2022 Recommendations for Reducing Infant Deaths in the Sleep Environment. Pediatrics, 2022.
- Apple Support. Use Background Sounds to help with sleep, focus, and more.
- Apple Support. Use the Noise app on your Apple Watch.
