Well, one possible plot could be that the other characters in Hetalia are initially shocked. They then have to take care of baby America. Maybe they struggle with things like feeding him, changing diapers. And as they do so, they might discover new sides of America's personality that were hidden before.
England could be one of the main caretakers. Despite their past differences, he would feel a sense of responsibility. Another could be Canada. Since they are related, Canada would surely step in to take care of his baby brother.
One idea could be that as America turns into a girl, there are cultural misunderstandings within the Hetalia world. For example, other countries might treat her differently based on gender stereotypes. Maybe she has to fight harder to be taken seriously in diplomatic meetings. Another plotline could involve her exploring her new identity and how it affects her relationships with other characters like England, who might have a very different dynamic with her now.
Well, one possible plot could be that the other nations have to take care of baby Italy. They might struggle with things like feeding him, changing diapers, and getting him to sleep. Maybe they also discover new aspects of Italy's personality that were hidden before.
One common theme is brotherly love. Since America and Canada are siblings in Hetalia, in these baby - themed fanfictions, they often show a pure form of brotherly affection.
If America in Hetalia turns into a girl in fanfiction, her personality might become more nurturing. While the male America was often brash and bold, as a girl she could show more empathy. For example, she might be more patient in diplomatic negotiations, listening more intently to the concerns of other countries.
I recall a fanfiction that focuses on the relationship between their guardians and Baby America and Canada. It shows how the two little ones grow up under different influences. The story is filled with both humorous and touching scenes, like when Baby America tries to imitate the grown - ups and Baby Canada is just there being his calm and observant self.
France would be a likely candidate. France has always had a sort of motherly - like affection for Canada. He would probably be very eager to take care of baby Canada, dressing him up in cute clothes and feeding him French cuisine, like crepes.
Japan could also be one to take care of baby Italy. Japan is known for being meticulous and organized. He might be able to handle the practical aspects of taking care of a baby like preparing proper baby food and creating a clean and safe environment for baby Italy.
One interesting fanfiction could be about baby America constantly getting into little adventures that England has to deal with. For example, baby America might try to climb a tree in England's garden and get stuck, and England has to figure out how to get him down in a gentle way.