Colours don’t have any kind of sex specific signifier other than what society tells us at the time.
“Until the 20th century toddlers of either sex were normally dressed in white, but when colours were used, boys were dressed in pink. At the turn of the 20th century, Dressmaker Magazine wrote: 'The preferred colour to dress young boys in is pink. Blue is reserved for girls as it is considered paler, and the more dainty of the two colours, and pink is thought to be stronger (akin to red).' As late as 1927, Time magazine reported that Princess Astrid of Belgium had been caught out when she gave birth to a girl, because 'The cradle…had been optimistically outfitted in pink, the colour for boys.'”