Make miniature nappies (real tiny) outta a old hand towel, cut it up and pin them shut. We played a game at mine where everyone got a minature nappy (one had melted chocolate in it) and you got the choice to swap your nappy with who ever your caught out using the magic word. At the end you open it up and see who "won" a prize. Game can also be played by everyone having two safety pins and the first one to catch you saying baby takes one of your pins until the end and you see who has the most.