By fall 2017 Washington state public schools will begin teaching gender expression to kindergarteners under newly-approved health education learning standards that designate sexual health a “core idea” of public K-12 education.

While some aspects of sexual health aren’t taught K-12 (HIV prevention begins in fourth grade), one component of sexual health titled “Self-Identity” begins in kindergarten, where students will be expected to “Understand there are many ways to express gender.”

The state’s health education glossary defines gender as “A social construct based on emotional, behavioral, and cultural characteristics attached to a person’s assigned biological sex.” Gender expression, meanwhile, is defined as “The way someone outwardly expresses their gender.”These definitions differ from the state’s definition of “biological sex”: “Based on chromosomes, hormones, and internal and external anatomy.”