Mad at the fancy strollers jamming up your sidewalk? Blame those damn babies and their fertility doctors, sure, but also blame Dutch designer Max Barenbrug, who invented the $800 Bugaboo. He doesn't think he did anything wrong, though. Today he refutes BusinessWeek's assertion that the uber-cool, all-terrain stroller is "the Mercedes-Benz of strollers: practical, built like a tank, and very expensive."

Since 2000, according to census figures released last year, the number of children under age 5 living in Manhattan mushroomed by more than 32 percent. And though their ranks have been growing for several years, a new analysis for The New York Times makes clear for the first time who has been driving that growth: wealthy white families.