I love party games
... I can only think of a few off the top of my head though ...
1) Fill a bunch of baby bottles up and see who can drink whatevers in them the fastest
2) Race to change the baby doll's diaper
3) Guess how big mom's belly is
4) Guess weight/length/birth date of baby
Check out http://www.babyshowerscentral.com/agames.shtml for more baby game ideas