Mom's tummy is probably pretty big around the time of the shower. But how big is it exactly? You can make a game of guessing the answer to that very question.
During the shower, pass around spools of ribbon, or balls of string or yarn, plus scissors. Each guest will try to estimate how big around the mother-to-be's belly is. To show off their guesses, each guest will clip off a piece of ribbon, string or yarn that she thinks is the closest size to that of the pregnant woman's middle.
Then place each guest's string around the mom's stomach and see who had the closest guess -- that person is the lucky winner!