"Warm Kitty" is a children's song, mostly known for its appearance in the US sitcom The Big Bang Theory

The Big Bang Theory

The Big Bang Theory is an American sitcom created by Chuck Lorre and Bill Prady, both of whom serve as executive producers on the show, along with Steven Molaro. All three also serve as head writers...

, sung by the character Sheldon Cooper

Sheldon Cooper

Sheldon Lee Cooper, B.S., M.S., M.A., Ph.D., Sc.D. is a fictional character from Texas on the CBS television series The Big Bang Theory, portrayed by actor Jim Parsons...

 where it is referred to as "Soft Kitty". The words to the song were written by Australian Edith Newlin, and are still under copyright. The tune for the song is traditional.

The Big Bang Theory version is slightly different, in that the verses are reversed. Instead of "Warm kitty, soft kitty" it's "Soft kitty, warm kitty" and the same happens with "happy kitty, sleepy kitty" which is reversed in the original.

Versions of the song have been released by Australian children's performer Patsy Biscoe

Patsy Biscoe

Patsy Biscoe is an Australian singer, notable for her television appearances on children's television shows, Here's Humphrey and Fat Cat and Friends...

, and by the long-running Australian Broadcasting Corporation

Australian Broadcasting Corporation

The Australian Broadcasting Corporation, commonly referred to as "the ABC" , is Australia's national public broadcaster...

 Children's TV show Playschool.