The baby picture game is an excellent icebreaker for showers where all the guests might not know each other.
With the baby shower invitations, include a request that each guest bring one of her own baby pictures. Then, at the shower, hang all the photos where everyone can see them. (Some suggest hanging them on a clothesline, or you can place them all on a table. Whichever way you display them, you won't want to use pushpins or tape, because they could damage the photos.)
Number the pictures. Give each guest a piece of paper and pen, and have them write down who they think is pictured in each one.
You can time this event for about 15 minutes, or you can allow guests to keep making their matches throughout the shower until the end.
Whenever you end it, the person with the most correct guesses wins.