"Runaway Baby" is a song by American singer-songwriter Bruno Mars from his debut studio album Doo-Wops & Hooligans (2010). It was written by Mars, Philip Lawrence, Ari Levine and Brody Brown. The former three produced the track under their alias, the Smeezingtons. "Runaway Baby" is a funk, pop rock, doo-wop and soul record. Its lyrics detail a playboy who is willing to break a woman's heart regardless of their feelings. Instrumentally, the track relies on finger snaps, police sirens, hand claps and guitar. It received mixed reviews from music critics, who considered it one of the standouts in the album, but criticized its lyrical content.