My two-year-old, Lucy, received her first full-on-running, tripping-and-skidding-on-cement knee scrape a few months back. Oh, the horrors. It was the most painful injury she’d yet experienced: little knee torn open and bleeding. As she sobbed and screamed in pain for what felt like interminable minutes, her body shook with the shock. Along with her discomfort, I could feel a sense of betrayal: the realization that being in her body could cause such pain. Yes, honey, it sure can.