Originally titled Mary's Lamb: English language nursery rhyme of nineteenth-century American origin, first published in Poems for our Children (1830). It has a Roud Folk Song Index number of 7622. It may have been inspired by a true incident. The first four lines are sometimes attributed to John Roulstone. It was set to music in the 1830s by Lowell Mason, but is usually sung to the melody of the chorus to "Goodnight, Ladies" (attr. to Edwin Pearce Christy).