Listen to Rock a Bye Baby online. Rock a Bye Baby is an Instrumental language song and is sung by Baby Lullaby Academy. Rock a Bye Baby, from the album Baby Lullaby: Rock a Bye Baby & Relaxing Music For Babies, Newborn Sleep Aid & Calm Baby Sleep Music, was released in the year 2018. The duration of the song is 2:35. Download Instrumental songs online from JioSaavn.