1 See, for example, “Sex Differences in Infants’ Visual Interest in Toys” by Gerianne Alexander, Teresa Wilcox, and Rebecca Woods, Archives of Sexual Behavior, 2009, vol. 38, p. 427–433; “Sex Differences in Interest in Infants Across the Lifespan: A Biological Adaptation for Parenting?” by Dario Maestripieri and Suzanne Pelka, Human Nature, vol. 13(3), p. 327–344; and “Sex Differences in Human Neonatal Social Perception” by Jennifer Connellan, Simon Baron-Cohen, Sally Wheelwright, et al., Infant Behavior & Development, 2000, vol. 23, p. 113–118.

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