A "bath sponge" is a soft, squishy, and porous object that people use to clean their bodies in the bath or shower. It helps to lather up soap and remove dirt from the skin. Full definition
The Safety 1st baby bath sponge is the perfect choice for bathing your baby. (littleangels.ie)
A few things can solve that: a soft bath sponge for the inside of the tub, and a thick bath mat or kneeler on the outside for you. (get-your-baby-to-sleep.com)
The Safety 1st bath sponge provides baby with bathing comfort and gives baby additional head, neck and back support resulting in a better bathing experience for baby and parent. (littleangels.ie)