Halliwell (a 19th century collector of nursery rhymes) wrote, "Another version. The nurse sings the first line, and repeats it, time after time, until the expectant little one asks, what next? Then comes the climax."

Thanks and Acknowledgements

This rhyme can be found in "The Nursery Rhymes of England" 5th edition (1886), collected by James Orchard Halliwell and illustrated by W. B. Scott.