Soft Kitty is a song that Sheldon's mother used to sing to him when he was sick. The song has been sung by six characters on The Big Bang Theory: Sheldon, Penny, Mary Cooper, Leonard and Amy. The song has also featured in The Big Bang Theory prequel Young Sheldon.
The lyrics for Soft Kitty, written by executive producer and co-creator Bill Prady, are: Soft Kitty, Warm Kitty, Little Ball of Fur. Happy Kitty, Sleepy Kitty, Purr Purr Purr.
The song was first introduced in the Season 1 episode The Pancake Batter Anomaly, where a sick Sheldon asks Penny to sing the song to him. Most recently, Sheldon sang the song to Amy when he tried to comfort her in The Inspiration Deprivation.
Soft Kitty has been featured in an episode of Young Sheldon. In "A Sneeze, Detention, and Sissy Spacek", Sheldon's extreme measures to avoid getting the flu leave him cut off from society, until his Meemaw encourages him to return to civilization. When Sheldon then comes down with the flu, his mother Mary is there to care for him and sing Soft Kitty to make him feel better.
This page has been updated to episode 1219. The Inspiration Deprivation
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Soft Kitty - Featured in these episodes:
Season 1, Episode 11 - The Pancake Batter Anomaly
This episode features the first mention of Soft Kitty. When Leonard, Howard and Raj abandon Sheldon after he catches a cold ("code milky green"), Penny is left to take care of him. Sheldon asks her to sing him Soft Kitty, as his mother used to when he was sick, and so he teachers Penny the words.
Season 2, Episode 21 - The Vegas Renormalization
After Sheldon is locked out of his apartment and forced to the spend the night at Penny's, he asks her to sing Soft Kitty to him. Penny says that's only for when he's sick, but Sheldon points out that homesick is a type of sick, so Penny relents and sings the song.
Season 3, Episode 8 - The Adhesive Duck Deficiency
The roles are reserved in this episode as Sheldon must take care of an injured Penny. Following a trip to the hospital, a medicated Penny asks Sheldon to sing Soft Kitty to her. Sheldon initially refuses as Penny isn't sick, but she counters that injured and drugged is a kind of sick. After Sheldon relents and starts singing the song, Penny suggests they sing it as a round.
Season 4, Episode 2 - The Cruciferous Vegetable Amplification
After Sheldon injures himself running down the stairs with his vintage 1977 Apple Two, Sheldon sends his virtual presence device, which Penny nicknames Shel-Bot, over to her apartment. He asks her to sing Soft Kitty to the computer monitor. When Penny starts singing, Sheldon begins to play the tune on the recorder.
Season 5, Episode 6 - The Rhinitis Revelation
After Sheldon catches a cold, Mary sings Soft Kitty to him as she applies VapoRub to his chest and puts him to bed.
Season 5, Episode 18 - The Werewolf Transformation
As Penny tries to convince Sheldon to let her cut his hair, she points out all the things she does for him, including singing Soft Kitty.
Season 6, Episode 22 - The Proton Resurgence
In a hospital room following his health scare, Sheldon sings Soft Kitty to Professor Proton. When Sheldon offers to sing it for him again, Arthur tells him the fourth time was the charm.
Season 8, Episode 13 - The Anxiety Optimization
After Sheldon drives himself crazy by staying up for days on end, Leonard and Penny try to put him to bed. When Sheldon tells them they can't make him go to sleep, Leonard and Penny sing Soft Kitty to him, at which point he falls right asleep.
Season 10, Episode 20 - The Recollection Dissipation
When Sheldon finally admits he is sick and lets Amy take care of him, he gets her to sing Soft Kitty to him in three different languages (English, German and Mandarin) while playing an autoharp. Sheldon then asks Amy to sing the song in the Navajo language, though the episode ends before we see Amy do that.
Season 12, Episode 9 - The Citation Negation
When Sheldon was feeling down about their paper being disproved, Amy offered to sing "Soft Kitty" to him.
Season 12, Episode 19 - The Inspiration Deprivation
As Sheldon tries to comfort Amy after she admitted feeling like she was letting everyone down, he sings Soft Kitty to her.