The public bought the idea that they were essentially a danger to their own kids and had better pay money for advice, that they’d better try really hard to do a good job, and they’d still inevitably fail. (Even though, as Lepore points out, kids are actually safer now than ever. In 1850, more than one baby in five died before its first year, by 1920 that had dropped to one in 20, and today infant mortality is at one in 200.)