Children were not color-coded at all until the early 20th century: in the era before domestic washing machines, all babies wore white as a practical matter, since the only way of getting clothes clean was to boil them.

20 世纪初期前的孩子们原来根本不分颜色：在家用洗衣机问世之前的时代里，所有的婴儿都穿白色，因为要让衣服干净的唯一方法是煮沸衣服。