Crèches in CH dont take children just for a day they must be signed up and go regularly (one or twice at least per week). You find some "halte jeux" in shopping centers and in some ski resorts but that has nothing to do with the creche system in Switzerland. I know it's very complicated but you can call the Red Cross they do assign babysitters if needed and that can also work if your child is sick and the creche doesn't allow your child to attend.