They told me it was coming—all of those elderly women standing behind me in the checkout line at the supermarket, when my three little girls had been whining and/or crying and/or begging me to buy them candy. The women would smile, tilt their heads wistfully, and say the exact same thing: “Enjoy it. It goes by so fast.” Every time, I would stare at them as if they’d spontaneously sprouted horns and think, “If I make it out of here without screaming into my reusable grocery bag, I’ll call it a parenting win.”