"Rock-A-Bye Baby" is a traditional nursery rhyme and lullaby that has been sung to soothe infants. The song describes a baby in a treetop, and it warns that if the tree falls, the baby will tumble down. Its simple melody and repetitive structure make it easy for caregivers to sing to children. The origins of "Rock-A-Bye Baby" date back to the late 17th century, with various versions appearing over time. It is often associated with themes of comfort and safety, making it a popular choice for bedtime routines. The song is commonly found in collections of nursery rhymes and is frequently used in children's music.