"By digging into the data, [Emily] Oster found that much of the conventional pregnancy wisdom was wrong. In Cribsheet, she now tackles an even great challenge: decision making in the early years of parenting. As any new parent knows, there is an abundance of often-conflicting advice hurled at you from doctors, family, friends, and the internet. From the earliest days, parents get the message that they must make certain choices around feeding, sleep,...