6 Moinths+. With the Fill N Fun Water Play Mat, young ones can experience water fun without even getting wet! The Fill N Fun Water Play Mat is a great tummy time activity that includes 5 water pals to push and try to grab. Rain or shine, youngsters can have fun in the sun with this brightly colored inflatable play mat that has delightful underwater scenes, fun fish, and a smiley sun painted around the edge. Simply fill the inflatable edge of the mat with tap water and kids can have hours of tactile and visual fun with the Fill N Fun Water Play Mat from Earlyears!