The author (not pictured) says she thought motherhood would be a 'second shift.' Elizabethsalleebauer/Getty Images/RooM RF Before having kids, I thought parenthood would be like a 'second shift,' after work. It's not like that. It's a constant hum running in the background of everything else. There's no clocking out of being a parent. The babysitter canceled at 2:14 p.m. I was standing in the kitchen between meetings, rinsing out a lunchbox that still smelled like overripe strawberries and w