Well, perhaps it could be about a magical spell that makes Amy turn into a baby. Then the story might focus on how her friends or family deal with this sudden change, like having to take care of her in a very different way than before.
Her best friend could be a main character. They might be the one who is most affected by her transformation and has to take on a lot of responsibility in taking care of her.
One idea could be that in this fanfiction, Wolverine turns into a baby due to a powerful mutant's accidental spell. The X - Men then have to take care of him while also trying to find a way to reverse the transformation. They might discover new aspects of Wolverine's personality as a baby, like his unwavering determination is now shown through his attempts to crawl towards danger.
In fanfiction, Sheldon and Amy's journey to having a baby can be filled with many interesting scenarios. Some fanfictions might focus on how Sheldon overcomes his initial hesitations about having a child, considering his unique personality traits. Maybe he starts to read all kinds of parenting books and tries to apply scientific methods to the idea of raising a baby. Amy, on the other hand, might be more excited from the start and gently nudges Sheldon along the way.
One idea could be that a villain's new invention accidentally zaps Kim and turns her into a baby. Her sidekick Ron has to take care of her while also trying to find a way to reverse the effect. He might struggle with basic baby - care tasks like changing diapers and feeding her, all while keeping her safe from the villain who might want to take advantage of her weakened state.
One possibility could be that an akuma's power goes wrong and instead of attacking Chat Noir in a normal way, it turns him into a baby. Ladybug is then left to protect this baby Chat Noir while also trying to find a way to reverse the transformation. She might have to take him to Master Fu for help, all while hiding him from Hawk Moth who could potentially use this situation to his advantage.
One great fanfiction with this concept is 'Baby Dean's Adventures'. It has a really cute take on how the other characters deal with a baby Dean. They struggle at first but then it becomes a heartwarming story of protection and family.
The main characters are, of course, baby Sonic and Amy. Baby Sonic is a younger version of Sonic, with all his speed and charm but also with a more innocent and naive side. Amy is known for her strong will and her love for Sonic, and in the fanfiction, she often plays a protective or guiding role for baby Sonic.
One common theme is family bonding. Amy and Ty's relationship deepens as they care for their baby together. Another theme is the growth of the characters. They become more responsible and learn new things about themselves as parents.
She might start to have a craving for blood, which could put her in a moral dilemma. Since she has always been a heroic character, this new urge would conflict with her values. Maybe she would try to resist it at first, seeking alternative ways to satisfy this new need without harming others, like trying to find some kind of substitute for blood.