Even though I'm a psychologist who specializes in early education, it took having kids to make me realize that sex differences aren't just the stuff of Brady Bunch reruns. While 18 months is old enough to have been influenced by stereotyped gifts, research suggests that many of the differences we see are evident from birth, and may even be hardwired. And that's just the tip of the iceberg.
The 3-year-old came home in tears from his public pre-kindergarten program, unable to adequately describe what had happened to him or how he had sustained bruises that stretched around his hips to his stomach.
