Hello, I'm an expert in cultural studies and social norms. It's important to note that colors are not inherently gender-specific, and the association of colors with genders is a social construct that varies across different cultures and time periods.

Historically, there has been no universal rule that blue is exclusively for girls. In fact, in the early 20th century, in the United States, blue was considered a color for boys because it was associated with the Virgin Mary, and pink was seen as a more assertive color, thus more suitable for boys. It wasn't until the 1940s and 1950s that these color associations were flipped, and pink became marketed towards girls.

The blue for girls association is a relatively recent phenomenon and is not consistent worldwide. In many cultures, color has little to no association with gender. It's essential to challenge these stereotypes and allow individuals to choose colors they prefer without being constrained by gender norms.

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Ladies' Home Journal article in June 1918 said, "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."read more >>