The theme of discovery is also popular. This includes Naruto discovering his own powers or the world around him as a baby. It could be something as simple as finding out he can make leaves move with his chakra at a very young age, which then sets the path for his future training and growth as a ninja.
Another theme is his potential as a ninja even as a baby. Fanfics often explore how his natural talents start to show early on, like his strong will and determination that are already evident in his infancy. They might also show how some of the villagers start to notice these things. For example, in some fanfics, an old ninja might see Naruto's determination when he tries to crawl towards something and realizes he has the makings of a great ninja.
Growth and potential. These fanfics usually show baby Sasuke having some signs of his future great power, like early hints of his Sharingan abilities. It's about his journey from being a baby with potential to the great ninja he will become. Well, in a lot of these fanfics, the relationship between Sasuke and Naruto also gets an interesting start. Maybe they meet as babies or toddlers, and there's some sort of connection or foreshadowing of their future rivalry and friendship.
One common theme is the bond between father and son. Naruto's journey of getting to know and care for baby Boruto is often explored.
One common theme is protection. Naruto is always there to protect baby Naruko from harm. Another theme could be family or a sense of kinship. Even though they may not be related in the traditional sense in the original story, in the fanfic, Naruto takes on a role like an older brother or a father figure. Also, the theme of heroism is prominent as Naruto is the hero who saves the day.
One common theme is redemption. Since Naruto travels back in time, he often tries to redeem the actions of others or make up for his own past mistakes. For example, he might try to save characters who met a tragic end in the original timeline.
Friendship can also be a key theme. Even as a baby, she could start to form bonds with future teammates or friends. Fanfics might explore how these early relationships influenced her development and her love for the sport. For instance, a childhood friend who inspired her to keep going in volleyball.
Friendship is also a big theme. It could show how baby Yugi starts to form those early bonds with his future friends. For instance, in some fanfics, baby Yugi might meet Joey Wheeler when they're both really young and their first interactions are filled with childish innocence and the start of a great friendship. And family is important too. How his family influenced his growth and the unique family dynamics in the fanfic world of baby Yugi.
Since I'm not overly familiar with 'amazingphil baby fanfic', but generally in fanfics, common themes could be growth and development. Maybe it's about amazingphil's early days or some fictional story where he is in a situation related to a baby or new beginnings.
One common theme could be the origin story. How baby Deidara discovered his love for art and explosives. Another might be his relationships with other characters in his early days.
One common theme is protection. Since Stiles is in a baby form, other characters often have to protect him from the various dangers in the supernatural world. Another theme is cuteness. Writers usually focus on the adorable things baby Stiles does like his little giggles or how he toddles around.
One common theme could be her early genius. Since Bulma is known for her intelligence, in baby Bulma fanfic, it might explore how her brilliant mind started developing even at a young age.