This Is How a Child Dies of Measles

The birthday-party invitation said “siblings welcome,” which means you can bring your 11-month-old son while your husband is out of town. You arrive a little disheveled and a little late. Your 5-year-old daughter rushes into the living room, and you make your way to the kitchen, wearing your son in a sling. You find a few moms around a table arrayed with plates of fruit, hummus, celery sticks, and carrots—no gluten, no nuts, no Red 40. These parents care about avoiding pesticides, screen time, and processed foods, and you do too.