30-something years ago, my Little Sister used to suck on face cloths in the bath. Now her niece does the same. Face cloths, sponges: same same.
Even better when mumma has cut up lots of coloured sponges into various shapes.
I wonder if the various colours make the sponges taste different? Entree, main, dessert perhaps? Personally, I probably would have left the pink one for last!