One of the popular lullabies and baby songs, Rock A Bye Baby is a joyful cradle song for babies and toddlers. The melody associated to the nursery rhyme is believed to be a variant of the Lillibullero, an English satirical ballad. Various versions of the lullaby are noted, with the first version printed in Mother Goose's Melody.
Several theories have been advanced to explain the origin of the rhyme. One of the theories suggests that the song was first composed by an English immigrant who observed how the native-American women rocked their little ones in birch-bark cradles. These cradles were suspended from trees' branches, thus allowing the gentle breeze to rock the baby to sleep.