Here's what we know:
* Earliest documented versions: The earliest documented versions of the rhyme date back to the 18th century.
* Possible origin: Some theories suggest it originated in England, possibly even earlier than the 18th century.
* No single author: As a folk rhyme, it's highly likely that the rhyme developed through contributions from many anonymous individuals over time.
So, while we can't pinpoint an exact date, it's safe to say that "Three Little Kittens" has been around for centuries and its origins are deeply embedded in folk tradition.