Why a steady sound can soften a sudden one
A baby’s hearing does not switch off during sleep. A sharp change in the room—a bang after a quiet stretch, for example—can stand out as the sound level rises abruptly. White noise reduces that contrast by adding a continuous background. In acoustics, this is called masking: when another sound is already present, a new sound may be less noticeable.
The sound does not need to drown out every interruption. By making the room’s soundscape more even, it can make some brief noises less startling. That may help a baby remain asleep through disturbances that might otherwise prompt a stir or wake-up.
The sound is a buffer, not a switch
White noise cannot guarantee uninterrupted sleep, and its effect depends on the sound, the room, and the baby. It also does not make a loud noise harmless; it simply changes how much that noise contrasts with the background. A calm, consistent sound can therefore be useful in a home where ordinary sounds—footsteps, a closing door, or activity in another room—come and go.
The key is the steadiness: the background makes sudden changes less distinct, rather than creating silence.
