Harry is known for his kindness and loyalty. So, he would take care of Draco with a lot of patience. He would probably stay up all night if Draco was fussy, just to make sure he was okay. His protective nature would also mean he'd keep Draco safe from any harm, whether it's from other wizards or just from the general dangers in the wizarding world.
One possibility could be that Draco is forced into taking care of Harry due to some magical circumstances. Maybe there's a spell gone wrong that makes it his responsibility. He initially resents it but as he spends time with baby Harry, he starts to see the innocence in him and develops a soft spot.
He might become more selfless. Usually, Draco is quite self - centered, but with a baby Harry to look after, he has to think about someone else's needs first. For example, he might sacrifice his own comfort to make sure Harry is warm and fed. Also, he could become more responsible as he has a life in his hands, and any mistake could be costly for Harry. This would be a huge change from his carefree, sometimes reckless, self.
Well, a great plot point could be Harry trying to figure out Draco's needs. Since he doesn't know much about taking care of a Malfoy baby, he has to learn quickly. He might discover that Draco has a particular preference for a certain type of lullaby or a soft blanket. Also, there could be a part where Draco gets sick. Harry would be really worried and would have to seek help from the magical world's healers. This could lead to some interesting interactions as he tries to keep Draco's identity as a Malfoy a secret to avoid any unwanted attention.
One possible plot could be that in a post - war world where things are turned upside down, Hermione discovers baby Draco alone and abandoned. She decides to take him in out of her sense of justice and kindness. She might struggle at first, trying to understand his needs as a baby Malfoy, but gradually, as she takes care of him, she starts to see the potential for change in him. Draco, as he grows up under Hermione's care, could start to develop different values than what he was taught in his pure - blood family.
Maybe it's the child of one of his friends or allies. For example, it could be the baby of Ron and Hermione. Harry would then be taking care of the baby out of loyalty and friendship.
One common theme is redemption. Draco often has a chance to be redeemed through Harry's care. For example, in many fics, Draco starts to question his previous actions and beliefs.
One popular 'harry takes care of draco fanfiction' is 'The Green-eyed Dragon'. In this fic, Harry discovers Draco in a difficult situation and decides to look after him. It's really heart - warming as it shows a different side of their relationship, with Harry being protective and Draco gradually opening up.
One common theme is redemption. Draco, who was often seen as a bully in the original series, is redeemed through taking care of Harry. Another theme is friendship turning into something more. As Draco cares for Harry, their relationship deepens and might develop into a romantic one. There's also the theme of trust, as Harry has to learn to trust Draco despite their past differences.
Harry might first try to figure out what's wrong. If the baby is hungry, he'll quickly get a bottle. If it's a wet diaper, he'll change it. Sometimes, he just holds the baby close and rocks it gently, humming a little tune. He doesn't get frustrated easily because he really cares about the baby.