In 2003, as the newly named editor in chief of Us Weekly magazine, Janice Min was busy documenting a seismic cultural shift: the making of the "Hollywood Mom." Think Angelina Jolie, Victoria Beckham, Halle Berry, and Beyoncé—stars who proudly displayed their pregnancies, shed the baby weight overnight, and helped turn the once-frumpy bump industry into seriously big business. In the blink of an eye, it seemed, "skinny jeans" had replaced "mom jeans." Bugaboos had become status sym...