In some Naruto fanfictions, Naruto babysitting Sakura as a child could be really interesting. It might show a different side of their relationship. Maybe Naruto has to take care of Sakura because her parents are away or something. He could teach her some basic ninja skills in a fun and childish way, like how to throw a kunai accurately using a game.
Their child could be a very powerful ninja. Since Naruto has the Nine - Tails' chakra and Sakura is a strong medical ninja with great physical strength, the child might inherit both. Maybe it could have Naruto's blond hair and Sakura's green eyes. It would also grow up in a village full of love and support, surrounded by friends and family, and would be trained by some of the greatest ninjas in the village like Kakashi.
There could be such fanfictions in the Naruto fan community. However, this goes against the original storyline of the Naruto series where Naruto is married to Hinata and Sakura is married to Sasuke. Fanfictions often explore alternative scenarios and relationships that deviate from the canon.
He could become very determined to find out why Sakura left and try to win her back. Naruto is known for his perseverance, and he wouldn't give up easily on his family. He might also start to question his own actions and wonder if he could have done something differently to prevent this.
In this fanfiction scenario, Naruto could also introduce Sakura to his training routine. He could show her how he practices his chakra control by climbing trees. Sakura, being the smart one, might quickly pick up on the technique and start to practice herself. This would not only be a great way for them to spend time together but also a way for Sakura to start her ninja training early. And Naruto would be proud to be the one who inspired her to start training.
The child would likely receive basic ninja training from an early age. This would include things like learning how to throw shuriken and kunai accurately. It would also be taught the basics of chakra control, which is fundamental for all ninja techniques.
Maybe she has some unresolved issues from her past, like her unrequited love for Sasuke that still lingers in the back of her mind. This could make her question her relationship with Naruto and lead to her leaving.
Their child would be a very interesting mix. Genetically, it's a really strange concept as they are not originally paired in the series. But if we consider it in the fanfiction world, the child might inherit Naruto's strong will and Sakura's medical and combat skills. Maybe it would have bright blond hair like Naruto and Sakura's green eyes. And it could have a unique chakra nature that combines Naruto's Uzumaki chakra with Sakura's possible chakra nature.
Perhaps an old enemy of Naruto or Sakura who was thought to be defeated but actually survived. They see the child as an easy target to get back at their parents. For example, if there was a rogue ninja from their past who held a grudge, they could come back and try to use the child to draw Naruto and Sakura into a trap. This antagonist would be very cunning and know all the weaknesses of Naruto and Sakura, which they could try to exploit through the child.
Well, perhaps the story could revolve around the child having a unique power that neither Naruto nor Sakura had. This power could attract both friends and enemies. The child might then have to learn how to control this power while also dealing with the expectations of being the child of two very famous ninjas. They could go on adventures to discover the origin of their power.