In Bugs Land is a giant tissue box on your left side as you enter. That and the one at the Nurse's Station are the only ones in DCA.
At Rancho Zocalo there is a passage way between the Rancho and Main Street. That is the only public companion bathroom but there is another at the nurse's station. The nurse's stations have tables for changing older folks that are private and the tables can be use for other things like to do medical stuff. The baby center has kid sized tables that can handle kids up to about age 5, not sure, as I do not go there, lol, do not own any kids.