Interestingly, one of the most common gender signifiers of today — team pink for girls and team blue for boys — wasn’t established until the 1940s. In fact, pink used to be considered a boy’s color, according to Smithsonian.com. For centuries, all children wore practical, white dresses — because they could be easily pulled up to change diapers and bleached when soiled — until the 1920s, when pink was deemed an appropriate color for boys.
“The generally accepted rule is pink for the boys, and blue for the girls. The reason is that pink, being a more decided and stronger color, is more suitable for the boy, while blue, which is more delicate and dainty, is prettier for the girl,” according to a 1918 copy of “Earnshaw’s Infants’ Development.”
Then, in the ’40s (for reasons unknown), clothing manufacturers decided on pink for girls and blue for boys, and this clothing standard persists today.