Why was Pink for Boys and Blue for Girls?

Pink for Boys and Blue for Girls might seem strange to modern eyes and sensibilities, but up until the 1940's a lot of people thought pink was the more masculine color and blue was clearly more feminine. So how did we end up in a world where it's 100% confirmed that pink is the marker of all things girly and blue denotes boyhood? Well it's a long strange story, so watch the episode to find out!