According to theories of gender constancy, until they're about 6 or 7, children don't realize that the sex they were born with is immutable. They believe that they have a choice: they can grow up to be either a mommy or a daddy.
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Girls' obsession with [pink] may seem like something they're born with, like the ability to breathe or talk on the phone for hours on end. But according to Jo Paoletti, an associate professor of American studies at the University of Maryland, it ain't so. When colors were first introduced to the nursery in the early part of the 20th century, pink was considered the more masculine hue, a pastel version of red. Blue, with its intimations of the Virgin Mary, constancy and faithfulness, was thought to be dainty. Why or when that switched is not clear, but as late as the 1930s a significant percentage of adults in one national survey held to that split. Perhaps that's why so many early Disney heroines — Cinderella, Sleeping Beauty, Wendy, Alice-in-Wonderland — are swathed in varying shades of azure.
