Prior to the baby shower, have your adult guests supply you with baby pictures of themselves. Place them on a poster board, and then at the party, have the guests guess who's who! It's good to have several small prizes, as you are likely to have more than one "winner." This game works well where you have a large group, ideally 10-20 photos. Some photos are easy to match to their adult owners, but it's surprising how tough some matches can be. I've done this one at several showers, and it was always a hit. Gets people to talking about their childhood!

Word of warning. Start well in advance gathering photos. Otherwise, people will forget to bring them, and you will be "gameless" at the party. Let me know what you think of this idea.