Since at least the 19th century, the colors pink and blue have been used as gender signifiers, particularly for infants and young children. The current tradition in the United States (and an unknown number of other countries) is "pink for girls, blue for boys". Prior to 1940, two conflicting traditions coexisted in the U.S., the current tradition, and its opposite, i.e., "blue for girls, pink for boys". This was noted by Paoletti (1987, 1997, 2012).
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