Purchase at least a dozen baby items (a diaper, bottle, pacifier, comb, etc) and arrange them on a tray. Pass the tray around the room, asking everyone to look at it. Then, remove the tray from the room.
Pass out a piece of paper and pencil to each guest. Tell them to write down as many things as they remember from the tray. The person who remembered the most things wins a gift!
At the end of the evening, the baby items, of course, go to the mom-to-be. If you wish, use a nice mirrored makeup tray to place the items on and give it to the person who remembered the most things!