Well, Naruto might face environmental challenges. For example, if the toddler is in a swampy area or a place with a lot of quicksand. Naruto has to navigate through these difficult terrains while protecting the toddler. Also, if there are other threats around like poisonous plants or insects, he has to be aware of them too. He can't just focus on getting the toddler out, but also has to ensure their safety during the whole process. This requires his full attention and all his ninja knowledge.
The Kumo ninjas could also be working in a coordinated way. They might have a strategy to isolate Naruto and keep him away from Hinata. Naruto has to break through their formation. And if the Kumo ninjas have some sort of intel on Naruto's abilities, they could plan their attacks accordingly. So Naruto has to be constantly on his toes and come up with new tactics to overcome these challenges and save Hinata.
One challenge could be that the enemy is too powerful for Naruto to defeat on his own. He might have to quickly level up his skills or find allies to help him. For instance, he might need to convince some of the more reluctant ninja in the village to join him in the fight.
Well, in this kind of fanfiction, Naruto might use his ninja skills to rescue the toddler from some dangerous situation like a group of bandits or a collapsing building. He would be quick and decisive, relying on his training and his kind heart.
Another problem might be the lack of proper resources. Even if Naruto has the ability to heal, he may not have all the necessary herbs or medical equipment. In the world of Naruto, some healing requires specific items. If they are in a remote location or in a battle - torn area, getting these resources could be a huge hurdle.
One common theme could be heroism. Naruto is known for being a hero, and in these fanfics, he shows his heroic side by saving the toddler. Another theme might be protection, as he safeguards the young and vulnerable toddler.
One challenge could be getting the necessary resources. Uzushiogakure was destroyed long ago, so finding materials to build the village again would be tough. He might have to negotiate with other villages for supplies.
One challenge could be that the heartless have a very different nature compared to the beings Naruto is used to dealing with. Their lack of emotions might make it difficult for him to find a way to connect and control them.
One challenge could be facing powerful new enemies. In fanfiction, authors often create unique and formidable foes for Naruto. These enemies might have strange powers or abilities that Naruto has never encountered before, forcing him to quickly adapt his fighting style. Another challenge could be the moral dilemmas. He might have to make tough decisions in the chaos of war, like whether to sacrifice a few to save many.
I'm not sure about a specific 'naruto saves toddler l fanfic'. But you can try searching on fanfic platforms like FanFiction.net or Archive of Our Own. They have a vast collection of Naruto - related fanfics and you might be able to find one with that plot there.
One possible plot could be that the toddler is from a different village and has some special power or ability that is yet to be discovered. Naruto saves the toddler from a natural disaster that has hit the toddler's village. As Naruto takes care of the toddler, he realizes the importance of the toddler's potential. This could lead to a story about Naruto helping the toddler grow and develop their powers while also protecting the toddler from those who might want to exploit the power for evil.