"...the generally accepted rule is pink for the boy and blue for the girl. The reason is that pink being a more decided and stronger color is more suitable for the boy; while blue, which is more delicate and dainty, is prettier for the girl."

Who knew? Pre World War II, it wasn't pink for girls, blue for boys. Here's a picture of a boy's sailor suit from the early 1900s, with lots of pink. (Link from girlhacker.)