The frequency of childhood gender-nonconforming behavior in a nationally representative sample.

= 1,213 parents; 55% female; weighted to match U.S. census benchmarks for age, sex at birth, race/ethnicity, region, education, and income). Parents identified 1.3% of children as a gender different from their sex assigned at birth. Of cisgender children, 73.4% showed at least some gender nonconformity in at least one domain (activities, clothing, friendships, or identity). Regular gender nonconformity was much less common: 9.6% of cisgender youth often or always showed gender nonconformity in at least one domain, and only about 1% did so in two or more. We further describe minor variability by gender, race, and age. Given other research suggesting that frequent gender nonconformity may signal elevated risk for bullying or mental health concerns, it is important to find ways to identify and support these youth to promote well-being and reduce mistreatment. (PsycInfo Database Record (c) 2026 APA, all rights reserved).