The idea that you need to save up a certain amount of money before having kids is so common it can feel almost like a moral law. Is “time confetti” ruining parenthood? You might feel time-poor. But the problem isn’t the number of hours you have. But it isn’t, and I said as much recently when a reader wrote in to my advice column asking if she’s too poor to have a baby. I argued that we don’t owe o...