One possible plot could be that the transformation is the result of a failed jutsu. Team 7 then has to take care of baby Kakashi. Naruto might be really excited at first, seeing it as a chance to be the responsible one for once. Sakura would be the more practical caretaker, making sure Kakashi is fed and clean. Sasuke would be a bit aloof but secretly curious about this strange situation.
The story could also focus on how Kakashi's decision to adopt Naruto affects the village's perception of Naruto. People might start to see Naruto in a different light, not just as the Jinchuriki but as Kakashi's son. This could lead to Naruto having a more positive experience growing up in the village, with less ostracism. Kakashi would have to navigate the politics of the village while also raising Naruto, which could add a lot of interesting twists to the plot.
Naruto could also be a great caretaker in his own way. He has a big heart and lots of energy. He'd be constantly playing with baby Kakashi and making him laugh. Although he might not be as organized as Sakura, his enthusiasm would keep baby Kakashi happy and entertained.
One possible plot could be that the magic in the world goes haywire. Natsu is caught in a spell that turns him into a baby. His friends in Fairy Tail are shocked at first. Lucy might take on the role of a caretaker, trying to figure out how to reverse the spell while also dealing with a baby Natsu's unpredictable behavior like randomly using small bursts of fire magic that are more like cute little puffs now.
Well, the plot could involve his teammates having to take care of him. They might struggle at first because Kuroko as a baby can't communicate in the same way. Maybe they have to figure out his needs like when he's hungry or sleepy. And they could also try to keep it a secret from the other teams to avoid any distractions during games.
The story could start with some sort of strange experiment gone wrong that turns Junkrat into a baby. The rest of the crew is shocked at first. Mei could use her scientific knowledge to try and find a way to reverse the process. Meanwhile, Reinhardt might tell stories to baby Junkrat about their adventures, as if he can understand. And Lucio could play some soft music to keep the baby calm.
Well, perhaps in the fanfiction, Sakura discovers she has a baby from some sort of mysterious experiment gone wrong. Kakashi, being the reliable and kind - hearted ninja he is, steps in to help her. He teaches her how to be a strong mother while also protecting the baby from those who might want to use it for their own evil purposes. They end up forming a little family unit of sorts.
Well, perhaps it could be about a magical event that causes Ash to transform into a baby. Then his friends have to take care of him while also trying to find a way to reverse the transformation. Maybe Pikachu has to protect baby Ash from other Pokémon who might mistake him for an easy target.
Maybe there's a new villain in the kingdom who has a device that can transform enemies into harmless forms, like turning Luigi into a baby. The villain wants to use this to stop Luigi and Mario from interfering with his evil plans. Mario has to protect baby Luigi from the villain's minions while looking for a way to break the transformation. This could involve exploring new areas of the kingdom and meeting new characters who might have the knowledge to reverse it.
Well, it could be that Edward is cursed by a powerful witch. The witch might be angry with him for some reason. And so, he turns into a baby. His friends then have to figure out how to break the curse while taking care of baby Edward. They might go on a journey to find a special herb or a magic item.
One possible plot could be that Ginny is hit by a magical spell that turns her into a baby. Her friends then have to figure out how to reverse the spell while taking care of baby Ginny. They might face challenges like finding the right ingredients for an antidote and dealing with Ginny's baby - like needs such as feeding and putting her to sleep.