What womb sounds are
Inside the womb, sound is low, filtered and continuous. High frequencies are dampened; what remains is a warm rumble with a steady pulse. The app’s womb audio combines a filtered noise bed with a heartbeat generator whose rate and warmth you can adjust, plus the option of a faster, softer baby-heartbeat pulse.
Because the heartbeat is synthesized rather than recorded, it does not drift out of phase with the noise underneath and it never reaches a loop point. It simply keeps going for as long as your baby needs it.
The Womb Calm mix and the mixer
Womb Calm — pink hush with a soft baby heartbeat — is one of the mixes ready on the home screen. You can also build your own:
- Heartbeat or baby heartbeat as the pulse layer
- Pink or brown noise as the hush underneath
- A touch of ocean or rain for movement
- Save the combination as a favorite for one-tap starts
For colic and the 3 a.m. wake-ups
Womb audio and shusher-style sounds are aimed squarely at the newborn weeks. When a wake-up does not settle on its own, Rescue mode brings in a stronger settle mix — brown hush plus heartbeat — and eases it back down over ten minutes. The sleep log records the night with whatever was playing, so you can see over time what actually helped.
Keep it gentle
Womb sounds are meant to be felt more than heard. Keep the volume moderate, place the phone at least two metres from the crib and use the soft fade-out. The app caps peak output in the audio engine and ramps every sound in over two seconds.
BabySleep is a sound and tracking tool for parents, not a medical device. Nothing on this page is medical advice; if you are worried about your baby’s sleep or health, talk to a pediatric professional.
Frequently asked questions
How is a womb sound different from white noise?
White noise is bright and even across frequencies. Womb sounds are low-pass filtered — warmer, deeper — and carry a heartbeat pulse. In the app you can blend between them in the mixer.
Can I change the heartbeat speed?
Yes. The heartbeat generator exposes rate and warmth, and there is a separate, faster baby-heartbeat option.
Is the womb sound free?
Core generated sounds and a two-layer mixer are free, which is enough for a heartbeat over pink noise. Premium adds the full catalog, four layers, Rescue mode and the AI tools.