I think Kakashi would be a likely candidate to take care of baby Naruto. He has experience leading a team and he's quite responsible. He could use his skills to keep Naruto safe and also start teaching him basic ninja values from a very young age. Also, the Third Hokage might get involved and ensure that Naruto is well - cared for within the village.
His friends like Sakura and Sasuke might step in to take care of him. Sakura, with her nurturing side, could handle feeding and cleaning him. Sasuke, though he might seem reluctant at first, would probably also protect the baby Naruto from any threats.
In the 'naruto becomes a baby fanfiction', it could be that the whole village comes together to take care of him. Since Naruto is the Jinchuriki of the Nine - Tails, the village has an interest in his well - being. Ordinary villagers might offer food and supplies, while ninja like Shikamaru could use his intelligence to figure out the best ways to keep Naruto comfortable and protected. Jiraiya, if he were around, would also be a great caretaker as he has a special bond with Naruto.
Kushina would take care of baby Naruto very tenderly. She would make sure he is well - fed before sleep, perhaps by breastfeeding him or giving him a warm bottle. She'd also check his diaper and change it if needed.
First, Minato would isolate Naruto to prevent the spread of the illness if it was contagious. He'd then research all he could about Naruto's symptoms. He'd make sure Naruto was in a warm and clean environment. Minato would also talk to Naruto, even though he was just a baby, believing that his voice could give Naruto some sense of security. He'd be very gentle when changing Naruto's clothes or cleaning him, always with a loving touch.
Iruka - sensei would be a likely candidate. He has always been like a father figure to Naruto, so he would probably step up and take care of baby Naruto.
Naruto uses his ninja skills. He's always on high alert, using his enhanced senses to detect any potential danger. His quick reflexes mean he can react in an instant if anything threatens the baby.
An oc can take care of Naruto fanfiction by having unique abilities that help the plot. For example, if the fanfic has a problem that the original Naruto characters can't solve easily, the oc with a special power can step in.
One possible character could be Jiraiya. He was Naruto's mentor later in life, but in a fanfiction, he could have taken Naruto as a baby. He had a close relationship with Naruto's father, so it would make sense for him to take Naruto under his wing from the start. Another could be Tsunade. As one of the Sannin, she has the power and the means to protect Naruto. Plus, she might have seen it as her duty to take care of the son of her old teammate.
In fanfiction, Ino might take care of Naruto by cooking him healthy meals. She could use her knowledge of herbs and plants to create nutritious dishes that help Naruto stay strong for his training.
In the fanfiction, Naruto would be super protective. He'd use his ninja skills to keep the baby safe from any harm. For example, if there was a threat, he could quickly create a barrier around the baby using his chakra. Also, he'd be really patient, which is a bit different from his usual impulsive self when it comes to taking care of the baby.
It would likely become stronger. Taking care of a baby together requires a lot of cooperation. They would have to rely on each other more, which would deepen their bond. They'd see different sides of each other, like Naruto's gentle side when he rocks the baby to sleep and Sakura's more motherly instincts.
Well, in such a fanfiction, Naruto would likely lose all his skills and knowledge as a ninja. He'd be completely dependent on others for care, like eating baby food and being diaper - changed. Maybe his friends would have to protect him from the enemies who might see this as an opportunity to get rid of him once and for all.