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by 6d0debc071 4578 days ago
1918:

"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." - Earnshaw's Infants' Department

http://en.wikipedia.org/wiki/Pink#Gender