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   What Do You Mean he's a Baby?! by Nightfire1023

   Fandoms: 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Anime), 鬼滅の刃 | Demon Slayer: Kimetsu no Yaiba (Manga)  

   • General Audiences
   • Creator Chose Not To Use Archive Warnings, No Archive Warnings Apply
   • Gen
   • Complete Work

   19 Sep 2025

   Tags

   • Creator Chose Not To Use Archive Warnings
   • No Archive Warnings Apply
   • Kochou Shinobu & Tomioka Giyuu
   • Shinazugawa Sanemi & Tomioka Giyuu
   • Rengoku Kyoujurou & Tomioka Giyuu
   • Tokitou Muichirou & Tomioka Giyuu
   • Kanroji Mitsuri & Tomioka Giyuu
   • Tomioka Giyuu & Uzui Tengen
   • Iguro Obanai & Tomioka Giyuu
   • Himejima Gyoumei & Tomioka Giyuu
   • Tomioka Giyuu & Everyone
   • Demon Slayer Corps Hashira | Pillars & Tomioka Giyuu
   • Sabito & Tomioka Giyuu
   • Tomioka Giyuu & Urokodaki Sakonji
   • Tomioka Giyuu & Tomioka Tsutako
   • Tomioka Giyuu & Ubuyashiki Family
   • Tomioka Giyuu
   • Kochou Shinobu
   • Uzui Tengen
   • Shinazugawa Sanemi
   • Iguro Obanai
   • Kanroji Mitsuri
   • Himejima Gyoumei
   • Tokitou Muichirou
   • Rengoku Kyoujurou
   • Ubuyashiki Amane
   • Ubuyashiki Kagaya
   • Urokodaki Sakonji
   • Kanzaburo | Tomioka Giyuu's Kasugai Crow
   • Demon Slayer Corps Hashira | Pillars
   • Ubuyashiki Family (Kimetsu no Yaiba)
   • Tomioka Giyuu-centric
   • Tomioka Giyuu Needs a Hug
   • Sad Tomioka Giyuu
   • Kochou Shinobu & Tomioka Giyuu Friendship
   • Hurt/Comfort
   • Age Regression/De-Aging
   • Hurt Tomioka Giyuu
   • Mentioned Tomioka Tsutako
   • Mentioned Sabito (Kimetsu no Yaiba)
   • Medical Inaccuracies
   • Past Child Abuse
   • Past Drug Use
   • Child Tomioka Giyuu
   • everything will make sense in the end
   • Medical Trauma
   • Trust Issues
   • Trust the Author
   • Sickfic
   • Fever
   • Vomiting
   • Protective Demon Slayer Corps Hashira | Pillars
   • Other Additional Tags to Be Added
   • Tags May Change
   • Angst
   • Fluff
   • Injury
   • Blood and Injury
   • Kid Fic
   • Implied/Referenced Child Abuse
   • Parental Urokodaki Sakonji
   • Parental Himejima Gyoumei
   • Everyone Needs a Hug
   • From a Baby
   • Kochou Shinobu is So Done
   • Protective Shinazugawa Sanemi
   • Kinda
   • just a little
   • Minor Original Character(s)

   Summary

   Giyuu gets hit with a Demon Blood Art and is now a baby. The other Hashira are not prepared to deal with it as they try to figure out how to reverse it.

   and inadvertently learn more about their Stoic colleague.

   ~~~~~~

   This is a progressive age story so bare with me at the start here...

   Series

   • Part 2 of The Flow of Water

   Language:

   English

   Words:

   44,375

   Chapters:

   26/26

   Collections:

   4

   Comments:

   784

   Kudos:

   7,760

   Bookmarks:

   1,125

   Hits:

   165,690

   Bookmarked by Hme23

   09 Jul 2026