According to Smithsonian.com: For centuries, children wore practical, white dresses up to age 6, which could easily be raised to change diapers, and the white cotton could be bleached clean. According to University of Maryland historian Jo B. Paoletti, author of Pink and Blue: Telling the Girls From the Boys in America, the colors weren’t gender-specific at first. The change toward gender-specific clothes gradual…
Source: Smithsonianmag.com