Don't Say Baby
When each guest enters the room, give them a diaper pin and ask them to pin it on their shirt.
When you're ready to begin the game, tell everyone they can't say the word "baby" for the length of the shower. You could also
set a time limit for this game so that people can relax afterwards.
When someone accidentally mentions the word "baby", the first guest who catches them saying it gets to have their diaper pin.
Whoever has the most pins at the end of the game wins.