For a brand-new baby, the most familiar sound in the world is the muffled, rhythmic noise of being inside the womb — a heartbeat, blood flow, and the soft hiss of the outside world filtered through tissue. Recreating that soundscape is one of the most reliable ways to calm a fussy newborn.
Why womb sounds work
Babies spend roughly nine months inside a noisy environment — louder than people realize, often around 80–90 dB. The constant whoosh of maternal blood flow, the rhythmic thud of the heartbeat, and the muffled sounds from outside the body create a "soundscape" the baby spends their entire developmental life embedded in. When they're born, sudden silence is unsettling. Womb sounds restore the familiar.
What's in Night Light X's womb library
Pediatric guidance: Keep volume around 50 dB (about the level of a quiet conversation) and place the device at least a meter from the baby's head. Use the sleep timer to fade audio out once they're asleep.
Best with amber or red light
Pair womb sounds with a low-brightness amber or red glow for nighttime feedings and settling. The visual + audio combination recreates the in-utero environment as fully as possible without rebuilding the womb itself.
How long to use them
Many parents find womb sounds most effective in the first 3–4 months. As babies move into their "fourth trimester" and beyond, you can transition to white noise or pink noise, which serve the same masking purpose without the specifically newborn-tuned profile.
Calm your newborn tonight.
Free on the App Store. Optional in-app purchases.