"Baby Fratelli" is The Fratellis' fourth single from their debut album Costello Music. It was released on 12 March 2007, in CD, 7-inch vinyl, and DVD single formats. A limited edition USB stick was later released on 19 March 2007. This USB stick contained a weblink to an exclusive documentary, as well as a competition to see The Fratellis in New York City on 23 March 2007. 7,000 copies of the USB stick format have been sold, although this format isn't chart eligible. The song was written by the band's lead singer, John Lawler
Time magazine named "Baby Fratelli" one of The 10 Best Songs of 2007, ranking it at #10. Writer Josh Tyrangiel, while criticizing the band’s lack of originality, and the derivativeness of the song, praised the "unapologetically glammed up, eight ball of a rock song", which he called "a high-energy ode to the thrill of stupidity, thus its prominent place on the Hot Fuzz soundtrack."
The video was filmed in Manchester in December 2006, and shows the boys playing on the roof of the Asia House apartment building on Princess Street, as well as showing clips from the 2007 movie Hot Fuzz, which features "Baby Fratelli" on its soundtrack.
Despite only charting at #24 in the UK Singles Chart mainly due to the 7,000 USB stick copies unable to register in the charts (although making it the band's fourth UK Top 40 single in the process), the single has received significant airplay on contemporary radio stations.