FOUNTAIN, Colo. — Coy Mathis was born a boy. But after just a few years, biology succumbed to a more powerful force.

A buzz cut grew into long hair. Jeans gave way to pink dresses. And the child’s big cheeks trembled with tears when anyone referred to Coy as male.

Halfway through kindergarten, after consulting with doctors, Coy’s parents informed their child’s school that Coy identified as a girl and should be treated as one — whether that meant using feminine pronouns to describe her or letting Coy wear her favorite dresses.

Read more in The New York Times.