Mei-Ling Hopgood, a first-time mom from suburban Michigan—now living in Buenos Aires—was shocked that Argentine parents allow their children to stay up until all hours of the night. Could there really be social and developmental advantages to this custom? Driven by a journalist’s curiosity and a new mother’s desperation for answers, Hopgood embarked on a journey to learn how other cultures approach the challenges all parents face: bedtimes, potty training, feeding, teaching, and more.