Baby is Justin Bieber’s first single that became a popular hit all over the world. In YouTube it is the second most viewed video. It was released as the lead single from the latter half of Bieber's debut album. "Baby" is a song by Canadian recording artist Justin Bieber. My World 2.0. The track was written by Bieber with Christopher "Tricky" Stewart and Terius "The-Dream" Nash, both of whom worked with Bieber on "One Time", and also by R&B vocalist Christina Milian and label friend, rapper Ludacris. It was offered for digital download on 18th of Jan 2010. The record got broadcast straight after announcement, The record is up-tempo R&B, merging together dance-pop and hip-hop essentials, although applying inspirations of doo-wop composition.