A pushchair with an adult-sized buggy board, so you can scoot along the pavement at top speed.
A raincover for the pushchair that goes over your baby AND you. It may not be very chic, but it will look a lot cooler than steering the pushchair with your elbows while trying to hold onto your umbrella.
A ray gun you can use on anyone who says, 'Oh, the baby weight just FELL off...'which makes their bum blow up to the size of an ocean liner.
Baby toys that don't bark, quack, moo, jingle or play You Are My Sunshine at 75mph when you tread on the them in the night.
A birthing pool with a water slide, wave machine and a poolside cocktail bar. Ok, it might not take your mind of the labour, but it might make it a bit more fun.
A Wet-Wipe dispenser that your baby can wear like a backpack, so you never have to scramble around in your bag every five minutes for them again.