Sex Differences in Infants’ Visual Interest in Toys

@article{Alexander2009SexDI,
  title={Sex Differences in Infants’ Visual Interest in Toys},
  author={Gerianne M. Alexander and Teresa Wilcox and Rebecca J Woods},
  journal={Archives of Sexual Behavior},
  year={2009},
  volume={38},
  pages={427-433}
}
Evidence indicating that sex-linked toy preferences exist in two nonhuman primate species support the hypothesis that developmental sex differences such as those observed in children’s object preferences are shaped in part by inborn factors. If so, then preferences for sex-linked toys may emerge in children before any self-awareness of gender identity and gender–congruent behavior. In order to test this hypothesis, interest in a doll and a toy truck was measured in 30 infants ranging in age… 
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    Archives of sexual behavior
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TLDR
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