Prenatal sex hormones (maternal and amniotic fluid) and gender-related play behavior in 13-month-old Infants.

  title={Prenatal sex hormones (maternal and amniotic fluid) and gender-related play behavior in 13-month-old Infants.},
  author={Cornelieke van de Beek and Stephanie H. M. van Goozen and Jan K. Buitelaar and Peggy T. Cohen-Kettenis},
  journal={Archives of sexual behavior},
  volume={38 1},
Testosterone, estradiol, and progesterone levels were measured in the second trimester of pregnancy in maternal serum and amniotic fluid, and related to direct observations of gender-related play behavior in 63 male and 63 female offspring at age 13 months. During a structured play session, sex differences in toy preference were found: boys played more with masculine toys than girls (d = .53) and girls played more with feminine toys than boys (d = .35). Normal within-sex variation in prenatal… CONTINUE READING


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