Another theme could be the future. The baby represents a new generation in the 'Once Upon a Time' world. Fanfictions might explore what the future holds for the baby, whether it will inherit certain powers or play a crucial role in the ongoing story of the magical realm. It could also be about how the baby's presence gives hope to the other characters for a better future in that often - chaotic fairytale world.
Love and friendship are also big themes. Some fanfictions explore a romantic relationship between them, while others focus on the deep friendship that can develop. They both have strong personalities, and seeing how they interact and support each other in different situations is a central part of these stories. There are often scenes where they confide in each other about their past traumas or their hopes for the future, which really builds on the themes of love and friendship.
Common themes in once upon a time baby fanfiction include the baby's journey. This could be a physical journey through different lands in the story's universe, or an emotional journey like learning about love and friendship at a very young age. Magic is often involved too. The baby might have some magical powers that are just starting to emerge, and this can lead to all sorts of adventures. For example, the baby's magic might accidentally cause some chaos in the village they live in, and then the story follows how the villagers and the baby's family deal with it.
Often, there could be themes related to magic and fantasy. Since 'Once upon a time' is often associated with such elements. Emma might be depicted as having some special powers even as a baby, and the fanfiction could explore how she discovers and controls these powers as she grows. It could also involve themes of friendship, as she meets different people who become important to her throughout her life.
Love and family are very common themes. Belle and Adam's love for each other deepens as they love and care for their baby together. It shows how their family unit grows and becomes stronger.
Another theme is the idea of magic inheritance. Fans often write about whether the baby will inherit Beast's strength or Belle's intelligence, or perhaps some new form of magic altogether. It's a way to expand on the magical elements already present in the original story.
One common theme is the struggle of parenting. Given Rumpelstiltskin's complex nature and Belle's more gentle side, they face challenges in raising their baby. For example, Rumpelstiltskin might be overprotective due to his past experiences.
Their relationship would likely become more centered around the baby. They would have to make decisions together as parents, which might cause some initial disagreements. For example, Rumple might be more protective in a way that Belle thinks is too overbearing.
One possible plot could be that their baby has some special magical powers. Maybe the baby is able to see into the future and warns Rumple and Belle of an upcoming danger in their fairy - tale land. This could lead to a series of adventures where they try to prevent the disaster from happening while also protecting their baby from those who might want to use its powers for evil.
Another option is to follow some 'Once Upon a Time' fanfiction writers on social media platforms. They might share their own works about Belle having a baby or know of other great stories in the same vein. You could start by looking for popular fanfic writers in the 'Once Upon a Time' fandom.
One common theme is love and relationships. Since the show has a lot of complex character relationships, fanfiction often explores different aspects of love between characters like true love's kiss and forbidden love. Another theme is redemption. Many characters in the show have a dark past, and fanfiction might focus on their journey towards redemption.