Obviously, Harry and Ron would be highly involved. They are Hermione's closest friends. Harry would likely be the one leading the effort to find a solution, given his heroic nature. Ron, on the other hand, would probably be more involved in the day - to - day care of baby Hermione, with his big, caring heart.
A great plotline could be the mystery behind who turned Hermione into a baby. It could be a dark wizard trying to stop her from achieving something in the future. As a baby, Hermione might start showing some unusual magical abilities that she didn't have before, which could attract the attention of both good and bad forces in the wizarding world. And her friends would be in a race against time to protect her and find a way to turn her back.
One possible fanfiction could involve Hermione being turned into an elf due to a misfired spell. In this scenario, she might struggle with the new form's limitations, like being shorter and having less physical strength. But, being Hermione, she would use her intelligence to adapt and find a way to reverse the spell. For example, she could search through ancient magical texts in the Hogwarts library to find a solution.
In a fanfic about Hermione turning into a baby, it could be a part of a time - travel plot. The time - travel magic somehow affects Hermione and reverts her to a baby. Her intelligence as an adult might still be somewhat present in her baby form, leading to some comical or interesting situations. For example, she might try to communicate complex ideas using baby sounds and gestures, and her friends would be left trying to decipher what she means.
It could be an old rival of the Malfoy family. Maybe a wizard whose family was wronged by the Malfoys in the past. This wizard has been biding his time, waiting for the perfect opportunity to strike. Turning Draco into a baby is his way of getting revenge on the family, making them look weak and powerless.
Perhaps it's a prank gone wrong. A group of Gryffindors, thinking they could teach Draco a lesson, cast a spell on him that they thought would just embarrass him. But instead, it turns him into a baby. Now, Hermione, being the brilliant witch she is, feels responsible for finding a cure. She starts researching in the library, while Ron is left to keep an eye on baby Draco. Ron has no idea how to take care of a baby, and there are lots of comical moments as he tries to feed Draco and keep him from crying.
Well, in such a fanfiction, probably Batman's sidekicks would have to take care of him. They'd be in a really strange situation, having to protect a baby Batman from the villains who might see this as a great opportunity to get rid of him once and for all.
Well, in such a fanfiction, Naruto would probably be really cute as a baby. His friends might be super confused at first. Sasuke might be a bit less brooding towards baby Naruto. And Iruka-sensei would probably take on a more parental role, making sure baby Naruto is safe and cared for.
Maybe it starts with a strange magical experiment gone wrong in Hogwarts. Harry is curious and gets too close, and suddenly he's a baby. The story could then focus on how the teachers, especially Dumbledore, deal with this situation. They might try to figure out if this is a new form of dark magic they haven't seen before. And Harry, as a baby, would have no memory of who he is, so it could also be about his friends trying to make him remember bits of his past life.
Perhaps an old enemy of Harry's family resurfaces. This villain might have a long - standing grudge against the Potters and sees turning Harry into a baby as a form of ultimate revenge. They could be using a spell that has been passed down through generations in their family, a spell that was created specifically to harm the Potters.