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Gravity-Warrior
Since: Jul, 2023
2024-09-28 10:10:15
https://tvtropes.org/pmwiki/pmwiki.php/Main/ParentInducedExtendedChildhood
This page might help. After a browse, it might be Postmortal.
Edited by Gravity-Warrior My two loves, pop culture and birds
Chabal2
Since: Jan, 2010

I only read about it here but can't remember the page, it might have been a novel or short story: A sci-fi story where humans discover immortality and it becomes accessible to all. One woman is dicovered to have used the process on her own baby (making it unable to grow older) so she could take care of it forever and the baby would never outgrow her.