An insert is a thin sheet that is mainly put in washable diapers. It catches stool and makes discarding or rinsing easier. In potty training, a sheet of kitchen paper is sometimes used in disposable diapers to make the wet feeling more noticeable.

Example: at night, with washable, there is an insert in the diaper. With a disposable diaper, a piece of kitchen paper is on top, so a small puddle can be felt more quickly.

Here's how it helps: with washable, cleanup becomes easier. With disposable, extra tactile wetness makes body signals clearer, making moments more identifiable.