Some of the more traditional pure - blood families might oppose it. They have strict ideas about family and bloodlines, and Harry and Hermione's situation doesn't fit into their narrow view. For example, the Malfoys might initially be against it, seeing it as a break from the 'normal' wizarding family structure.
The Ministry of Magic could potentially oppose it if they think Harry and Hermione are too young or inexperienced to raise a child. There might be regulations in the wizarding world about who can be a legal guardian, and they might worry about the baby's safety and well - being in the hands of two young wizards who are still finding their way in the post - war world.
Some of the more traditional pure - blood families in the wizarding world might oppose it. They could think that Harry, as a single man, is not fit to raise a child properly. Also, certain members of the Ministry of Magic who are strict about family regulations might be against it at first.
One possible plot could be that Harry and Hermione find an orphaned baby during their post - Hogwarts adventures. They decide to take the baby in and raise it as their own. Along the way, they face challenges like protecting the baby from dark forces that might be interested in the child's potential magic. They also have to balance their own relationship and the new addition to their family life.
They might face social challenges. In the wizarding world, there could be those who don't approve of their relationship or their decision to raise a child together. Also, financial challenges could arise. Even though they are heroes, they still need to provide for the child's needs, like education at Hogwarts which might have costs associated with it.
Yes, there are likely fanfictions where Harry Potter calls Hermione 'baby'. Fanfiction writers often explore different relationships and character interactions in the Harry Potter universe, and this kind of endearing or unexpected use of language can be a part of their creative interpretations.
Voldemort's remaining followers could be antagonists. They might see the baby as a new threat or a potential weapon. They could try to kidnap the baby to use its power for their own dark purposes.
There could be a new dark wizard or witch emerging. This character could be jealous of Harry and Hermione's influence and see the baby as a way to get to them. They might try to harm the baby or turn it against Harry and Hermione, creating a lot of conflict and danger in the story.
One challenge could be getting Hermione to eat. Babies can be picky eaters, and in the wizarding world, there might be special potions or foods that Hermione needs but doesn't like. Another challenge is keeping her safe from magical accidents. With all the magic around, a simple spell could go wrong and put Hermione in danger.
The baby could be an orphaned werewolf cub. Derek, being a werewolf himself, might feel a special connection to it and Stiles, being his friend, would support him in raising it.
Their relationship would shift from a purely platonic friendship to a deeply committed partnership. Harry would become more protective of Hermione, not just as a friend but as the mother of his child. Hermione would see Harry in a new light, as a co - parent and a life - long partner. They would have to communicate on a different level, sharing not only their thoughts about the baby but also their hopes and fears for their future as a family. There would also be some awkward moments as they adjust to this new dynamic, especially in front of their old friends who are used to seeing them as just friends.
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.