Background Retrospective and cross‐sectional studies often report associations between childhood gender nonconformity and greater emotional and peer difficulties. This study used the ALSPAC birth cohort to investigate relationships between childhood gender‐typed behavior and peer and emotional problems throughout childhood and adolescence. Methods A total of 11,192 participants had at least one measure of parent‐rated gender‐typed behavior in infancy; 7,049 participants had a measure of child‐rated gender‐typed behavior at 8.5 years. Separate linear mixed regression models were fitted to assess whether parent‐rated and child‐rated gender‐typed behaviors were associated with emotional and peer problems across childhood and adolescence (6–16 years old). The effect of adding covariates (self‐esteem, abuse, bullying, feeling accepted by peers, and feeling different) on these relationships was assessed. Results For boys, more gender‐nonconforming behavior was associated with greater subsequent emotional and peer problems in childhood and adolescence. Adjusting for self‐esteem, relational bullying victimization, feeling different, or feeling accepted by peers reduced some of these associations. In contrast, for girls, more gender‐nonconforming behavior was associated with fewer emotional problems in childhood and adolescence. In girls, self‐reported gender‐nonconforming behavior was also associated with fewer parent‐rated peer problems but parent‐rated gender‐nonconforming behavior was associated with more parent‐rated peer problems; this latter association was partly explained by self‐esteem, bullying, and abuse victimization. These associations were statistically significant but small. Conclusions Overall, more female‐typical behaviors were generally associated with greater subsequent emotional and peer problems, for both boys and girls. Future studies should investigate factors that reduced these associations, as well as potential negative effects of female‐typical behaviors or advantages of male‐typical ones. As this was a 14‐year longitudinal study, the relationships between gender‐role behaviors and emotional/peer problems warrant further research despite the small association sizes.

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