Before having Claire I couldn't understand why some mothers — even the die-hard feminists who eschewed all traditional takes on gender roles — would dress their baby girls in pink, frilly clothes all the time. And as soon as Claire was born, I discovered why. It's because whenever she's not wearing pink she's often mistaken for being a boy. And I'm sure that this is the exact reason most parents dress their baby boys in predominantly blue wardrobes as well. I have personally never questioned these color associations with gender before. I always assumed that they are what society once deemed appropriate, and so I — along with billions of others — automatically grew up thinking this way. What's strange about this assumption is just...