Infants Prefer Toys Commonly Associated With Their Gender

Children as young as nine months old prefer to play with toys specific to their own gender, according to a new study. The research suggests the possibility that boys and girls follow different developmental trajectories with respect to selection of gender-typed toys and that there is both a biological and a developmental-environmental components to the sex differences seen in object preferences.

Source: Infants prefer toys typed to their gender, says study — ScienceDaily