Why did those two stick vs other colours like red, green, or yellow? I did a bit of searching and apparently it used to be reversed where blue was for girls and pink was for boys. Why was it swapped? How many times did it swap? Was there ever a time where other colours represented men and women?

Was this association always the case, or is it a modern thing? During feudal times, I read that purple was a symbol of royalty because it was a rare/expensive dye, but did it also symbolise the union between the king and queen as well?

It probably isn’t too ancient since there aren’t many blue and pink things in the natural world besides flowers (but those come in all sorts of other colours too) and the blue sky (which isn’t associated with either men or women really)

No two colours have such a strong association with either men or women than blue and pink, which I think is really weird. What happened with yellow, red, green, etc.?