Summary: Checking Google Books shows lots of references to pink for girls/blue for boys, and no references to the opposite, going back to the 19th century.
Note: Wikipedia links to this article, but summarizes it in a way which makes it sound much weaker than it really is.
Off the top of my head:
http://www.cell.com/current-biology/retrieve/pii/S096098220701559X
So far as I know, the association of pink with girls and blue with boys is a western custom which only goes back a century or so.
Response to old post:
Appears to be an urban legend.
Summary: Checking Google Books shows lots of references to pink for girls/blue for boys, and no references to the opposite, going back to the 19th century.
Note: Wikipedia links to this article, but summarizes it in a way which makes it sound much weaker than it really is.
Thanks. I hope that someone gets around to actually looking at the clothes and/or paintings.
Precisely.