Baby hairs arguably became popular in the 1920s, possibly popularized by Josephine Baker.
While it's difficult to pinpoint the exact origin and person responsible for the baby hair styling trend, the 1920s is a strong contender for when it first gained popularity, largely thanks to the influence of Josephine Baker, a legendary Black actress and entertainer. Her iconic looks often featured styled baby hairs, contributing to their visibility and acceptance within popular culture.
It is important to note that styling of baby hairs has cultural significance and roots in Black and Latina communities, with long historical ties that predate its mainstream adoption.