Everyone tells you how hard the first few months of being a mum will be. You know there will be sleepless nights, sore boobs, not knowing what the hell is going on and you survive in a haze of sleep deprivation. At some point without you even realising it starts to get a bit easier, you get a few more hours sleep, you learn to interpret the cries and you can manage a full cup of tea whilst your little monkey is happily bouncing around in a jumperoo. Then that day arrives, the return to work and the goalposts change…