Two aspects of children's early gender development -the spontaneous production of gender labels and sex-typed play -were examined longitudinally in a sample of 82 children. Survival analysis, a statistical technique well suited to questions involving developmental transitions, was used to investigate the timing of the onset of children's gender labeling as based on mothers' biweekly reports on their children's language from 9 through 21 months. Videotapes of children's play both alone and with mother at 17 and 21 months were independently analyzed for play with gender stereotyped and neutral toys. Finally, the relation between gender labeling and sex-typed play was examined. Children transitioned to using gender labels at approximately 19 months on average. Although girls and boys showed similar patterns in the development of gender labeling, girls began labeling significantly earlier than boys. Modest sex differences in play were present at 17 months and increased at 21 months. Gender labeling predicted increases in sex-typed play, suggesting that knowledge of gender categories might influence sex-typing before the age of 2.Keywords gender development; self-socialization; language development; play; sex differences A growing body of research in social and developmental psychology demonstrates that the salience of social categories and, in particular, the verbal labeling of social groups, affect perceptions of social category distinctions. Category labels signal the importance of categoryrelevant information and influence inferences made about social group members (e.g., Bigler, 1995;Diesendruck & haLevi, 2006;Gelman & Heyman, 1999;Katz & Seavey, 1973). From a developmental perspective, it is important to examine children's understanding of gender as Address for Correspondence: Kristina M. Zosuls, Psychology Department, New York University, 6 Washington Place, New York, NY 10003, E-mail: kmz205@nyu.edu.
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NIH-PA Author ManuscriptNIH-PA Author Manuscript NIH-PA Author Manuscript a social category because it is typically the first collective social identity that children learn and is associated with a range of stereotypes used by children and adults to make inferences about others . Even as early as preschool, children demonstrate knowledge of gender stereotypes (Martin, Ruble, & Szkrybalo, 2002), and use gender category information to make inferences about ambiguous behavior (Giles & Heyman, 2004). It is therefore important to ask: When do children first label gender categories? What are some consequences of this ability?In addition to visual cues, such as physical appearance, verbal labels might be important cues for learning social categories at a very young age (Baron, Dunham, Banaji, & Carey, 2007;Gelman, Taylor, & Nguyen, 2004). For instance, when parents use gender labels when they point out the actions of other people (e.g., "See that boy running fast!") rather than gender neutral labels (e.g., "child"), they make gender category information salient. Thus, an examination of childre...