Search Research: Pink vs. Blue

As endless gender recent reveal parties have shown us...... these days, in the US at least, the colors of pink and blue have commonly-agreed upon gender meanings. Pink means female, blue means male. But, why? Or, as a way to figure out the why perhaps we can think about it this way: when did pink come to mean female and blue come to mean male? This leads to today's SearchResearch Challenges: 1. Can you figure out the history of pink meaning female Has blue always signified male? Has pink always signified female? 2. And, young boys used to wear dresses (or some kind of gown) in their early photos. When did that practice stop? (Or has it?)