My husband and I decided to be a one-child family long before our son Oliver was born. With several years of reproductive-health scares behind me, conceiving a child felt like a Powerball win; I didn't need another chance at the jackpot. Scott thought we could avoid the inevitable slings and arrows of sibling warfare. We both hail from large families, in which continuation of the family name is assured through siblings and cousins. We were content with our decision, and our families took it well, too. A few months after Oliver was born, I bagged up my maternity clothes for a tag sale, and Scott started researching permanent birth-control options.