Why does my baby sleep better with white noise?

Babies often sleep better with white noise for a few simple reasons:

1. It mimics the womb environment

The womb isn’t silent — babies hear a steady mix of sounds like blood flow, heartbeat, and digestion. A constant background noise can feel familiar and soothing after birth.

2. It masks sudden noises

White noise helps cover up sharp sounds like a door closing, a dog barking, or footsteps in the hall. That can reduce startle responses and make it easier for a baby to stay asleep.

3. It supports sleep transitions

Babies cycle through light and deeper sleep frequently. A steady sound can make those transitions feel less abrupt, so they’re less likely to fully wake from small noises.

4. It can become part of the sleep routine

If white noise is used consistently at naps and bedtime, babies may begin to associate it with sleep and winding down.

Safety note

If you use a white-noise machine, keep the volume low and place it away from the crib or bassinet. Exact safe volume and distance can vary by device and guidance, so it’s a good idea to check your pediatrician’s advice and the manufacturer’s instructions.