Simon Baron-Cohen (cousin to the comedian) has an incredible book on gender differences in psychology called "The Essential Difference", where he puts forth the

Simon Baron-Cohen (cousin to the comedian) has an incredible book on gender differences in psychology called "The Essential Difference", where he puts forth the theory that Williams Syndrome is a condition diametrically opposite from autism: whereas autistics exhibit hyper-masculine behavior, children with Williams Syndrome exhibit hyper-feminine behavior. As he describes it, children with WS have verbal and social abilities that far outpace their physical development, while suffering severe mental retardation in pretty much all other areas, especially spacial and quantitative reasoning. As others have mentioned, the condition also results in physical changes including pale skin, stunted growth, and abnormal facial features. It's not something one might wish upon one's children.