Count out pieces of candy and stick them inside a clean baby bottle. Make sure you keep a record of the answer.
At the baby shower have guests pass the bottle around, write down their name and guess on a piece of paper.
The person who guesses correctly or closest to the actual amount is the Winner and gets to keep the baby bottle filled with candy.
If more than one person guesses exactly right, fold up the pieces of paper to let the pregnant guest of honor act as the tiebreaker to choose a winner.