system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are boys considered blue and girls considered pink?

I mean: clothes, etc., for baby boys are always blue and for girls they're pink. I'm wondering how that came.
gpt
For most of history, colour has not been associated with a gender. In the 19th century, the reverse of the current situation became fashionable in Europe -- pink as a colour for boys, and blue for girls. Rumour was that this originated in using blue for blue-eyed babies or blond(e) babies and pink for brown-eyed or brown-haired, with girls being more likely to be blonde or blue-eyed -- but there's no way of knowing if that is the origin, or just what some magazines happened to advise.

This fashion spread up until around the mid-20th century. In 1948, Prince Charles was born. His nursery was decorated in pale blue, and he was seen wearing pale blue clothes. Magazines did colour-photograph features on the royal baby, and it was something of a sensation, like the royal wedding was recently (Charles being the future king, and all). It's often said that this was the event that made blue a fashionable colour for boys, as mothers around the UK started dressing and decorating like their Queen did, then catching on in other English-speaking countries.

There's no way to know if that's definitely true, because this isn't some iron law that was signed into effect on a given day, but it's *probably* true, or at least a major influence, because that is the time that pink and blue reversed their positions and became actual gender signifiers (prior to this, blue was generally associated with girls and pink with boys, but it wasn't taboo to wear the alternate colour and those colours weren't used to *represent* girls and boys).