Pretty in pink?

Pink for a girl, blue for a boy...  We're so used to the idea today, that it comes as somewhat of a surprise to find that a hundred or so years ago it was the reverse - pink was considered the appropriate colour for boys and blue for girls. And prior to that, children of both sexes were generally dressed in white, and usually dresses at that.  Indeed, somewhere among my souvenirs there is a photo of me aged about 2 with blond ringlets in what looks suspiciously like a dress!  So is girls' love of pink today (my granddaughters all wouldn't be seen dead without a pink mobile 'phone) more a matter of nurture rather than nature?