I had Pin The doodle on the Dude at mine! LOL
Um also guessing the girth of the mum to be. use either some toilet paper or ribbom or something & every one guess a length of how much it will take to fit around mums waist. The closest wins. A good Ice breaker is to get everyone to take the length of toilet paper they think they will need for the duration of the party & then get everyone to go around in a circle & give some parenting tips for each square of toilet paper they have. Don't tell them this what they have to do untill after they have their length of paper. The peg game. Get everyonr to take turns at holding a baby (doll) and see how many pegs they can remove from the clothes line (rope or curtain works well for inside) using only one hand & without using anybody part to correct the pegs so they don't drop any. The winner is the person who can hold the most with out dropping them.
LOL Guess the smell! Put some interesting smells in some disposable nappies & see if people can guess (peanut butter etc).