One common theme is the family aspect. Focusing on the relationship between Naruto's parents, Minato and Kushina. Another is the village's anticipation and concern about a new life with the Uzumaki bloodline.
A prevalent theme in these fanfictions is the power that Naruto is born with. The Uzumaki bloodline gives him certain abilities, and the fact that he is to be the host of the Nine - Tailed Fox also adds to his power potential. Writers often explore how this power was perceived at the time of his birth. Some might write about how some in the village were afraid of this power, while others saw it as a chance for the village to become stronger. There could also be a theme of destiny, as Naruto was clearly destined for great things, and this can be traced back to his birth in fanfiction.
In Naruto birth fanfiction, family is a big theme. How Minato and Kushina's love for each other and for Naruto shaped his birth. The Uzumaki clan connection is also a theme, as Naruto's mother was from that clan. It's often explored how the clan's traits and powers might have influenced his birth. Also, the theme of destiny. Naruto was born to be a great ninja, and fanfictions like to show how his birth was fated, perhaps with signs or omens that pointed to his future importance.
One common theme could be the medical aspect, like how the medical team deals with the situation. Another might be the emotional turmoil of the mother and those around her. It could also explore the sense of urgency and the various efforts made to ensure a safe delivery.
Often, there is a theme of redemption or second chances. Maybe in the original story, Hermione and Harry had some missed opportunities or regrets. In this fanfiction, having a baby together gives them a chance to start anew. They can build a different kind of future for themselves and their child. And there is also the theme of friendship, as they have to deal with how their relationship change affects their friends, like Hermione's relationship with Ginny and Harry's with Ron.
Another theme is discovery. As a baby, Naruto is full of potential. Fanfictions often explore the discovery of his powers or his unique connection to the Nine - Tails at a very young age. For example, some stories might have baby Naruto unknowingly using a bit of the Nine - Tails' chakra in a moment of distress, which then leads to a whole new plot about how the village reacts.
Well, in Naruto and Shizune baby fanfiction, there are several recurring themes. Firstly, there's the theme of new beginnings. Having a baby is a new start for both of them, and it can bring out different aspects of their characters. Secondly, the theme of legacy might be present. Naruto has his own story and reputation, and now with a baby, he might think about the legacy he wants to leave. And of course, the theme of love and protection. Shizune and Naruto would need to love and protect their baby from all the perils of the Naruto world, and this can be a central focus of many fanfictions.
One common theme is family. Since it's about Naruto and Sasuke's babies, it often focuses on how they raise their children and the family values they pass on. Another theme is the continuation of their friendship/rivalry. Their relationship is so iconic that it often plays a role in the stories of their children.
Well, protection is a very common theme. Given the dangerous world they live in, Naruto and Sasuke are constantly trying to protect their baby from all kinds of threats. Also, the theme of growth is present. As the baby grows, it also affects the growth of Naruto and Sasuke's relationship, making them more mature and responsible.
Protection is also a big theme. Naruto is always protecting Sasuke in these stories, whether from external threats or from Sasuke's own inner demons. It's like Naruto is a shield for Sasuke. And friendship is there too. Even though Naruto is in a father - like role, the essence of their friendship from the original story is still there, just in a different form.
One common theme could be family. If Naruto gives birth to kits, it would be about creating a new family unit within the Naruto universe. Another could be the idea of change. Naruto's life would change drastically with this new addition, and the story could explore how he adapts.
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.