I thought I was simply babysitting while my sister went shopping. But my niece’s cries told me something was wrong. One discovery sent us straight to the hospital.

Holding my breath, I slid the fabric down just enough to expose her diaper line. Her right leg kicked in erratic, frustrated spasms. Her left leg lay utterly, terrifyingly still.

A cold dread coiled in my gut. I peeled back the adhesive tabs of her diaper. At first glance, I saw only the familiar, soft folds of an infant’s thigh. But as I pushed the fabric of the sleeper further down her left hip, the breath evacuated my lungs.

There, blossoming high on Paige’s upper thigh and disappearing beneath the diaper’s elastic, was a violent, dark mass. This wasn’t a pink chafe mark or a faint impression from tight clothing. It was a deep, necrotic purple at its epicenter, radiating outward into a sickly reddish-blue halo. The surrounding tissue was so gorged with swelling that her left thigh was visibly thicker than her right.

For two paralyzing seconds, I just stared. Then, Paige attempted to wriggle. The resulting scream felt as if it physically pierced my eardrums. My hands began to violently tremble—a weakness I despised in that moment, because Paige needed me to be a fortress. I swiftly, loosely drew the sleeper back over her legs without securing the snaps.

I reached for my phone. My thumb hovered over Kate’s contact name for a fraction of a second. If she was forty minutes away hunting for bargains, what exactly was I going to ask her? For permission to seek emergency medical intervention?

No.

I hoisted Paige with surgical precision, supporting her entire spine without allowing gravity to pull on her left leg. She whimpered against my neck, the sudden drop in volume terrifying me almost as much as her screaming had. Grabbing my purse and the diaper bag, I rushed to the garage. Securing an injured baby into a curved infant carrier without exacerbating the trauma took me an agonizing, sweat-drenched minute. Every red light on the twenty-minute drive to the pediatric emergency room felt like a personal vendetta. I kept glancing at her reflection in the rearview mirror. Her eyes were squeezed shut in silent misery.