It’s a song by South Korean boy band BIGBANG.
“Fantastic Baby” is the third single from their fifth Korean-language extended play titled “Alive”.
It was released officially as single on March 7th, 2012. A Japanese-language version was released in March, 2012, on the Japanese version of Alive. The song was translated by Korean-Japanese member of M-Flo and Verbal.

The Music Video was one of YouTube’s most viewed K-pop music videos in 2012, and was featured in the British newspaper The Guardian.

As of March 2014, the official music video for “Fantastic Baby” on YouTube had over 100 million views, making it the 4th Korean MV to do so, after PSY’s Gangnam Style and Gentleman, and Girls' Generation’s Gee, and the first by a Boy band.

Arirang TV news considers the song as part of BIGBANG’s “mega hits”. Kevin Perry from the British music publication NME wrote that “Fantastic Baby” features the boy band wearing Fancy costumes and embracing riot chic. He also mentions about the “Boom Shakalaka” refrain that reminds the listener of music from Sly & The Family Stone. The Daily Telegraph recommended its readers to “try Fantastic Baby by the boyband BIGBANG, whose video rivals Lady Gaga for fashionista eccentricity and excess.” The Vancouver Sun wrote

Fantastic Baby is easily one of the most colourfully twisted pop videos we’ve seen in a while, combining RPG style art, riot gear, steampunk elements and street pop swagger."