Can't go wrong with baby bingo

If you have cake you can put one stamp on the bottom of a plate, whoever gets it wins.

The toilet paper game, the guess how many sheets it takes to go around your whole belly, whoever gets it or closest wins.

You can fill a baby bottle with your choice of candy and the closest one wins. Or the clothes line clips game, everyone starts off with one clip, if they see someone cross their legs you take the clip from them, whoever has the most wins.

like have them put their names by their guesses.