I think you may use [kid][1]; the term is from the late 16th century:
- c. 1200, "the young of a goat," from a Scandinavian source such as Old Norse kið "young goat,"
- Extended meaning "child" is first recorded as slang 1590s, established in informal usage by 1840s. Applied to skillful young thieves and pugilists since at least 1812.
Etymonline [1]: http://www.etymonline.com/index.php?term=kid