Coming back to work after having a baby is a challenge. There are conflicting desires to be among intelligent adults and also at home with your child; usually you are dealing with quite serious sleep deprivation and often there’s the logistical complication of trying to breastfeed your baby before work. New dad Mark Zuckerberg may not have to deal with that last one but he’s not the first parent to realise that work will only run smoothly if you streamline your life with brutal efficiency.