One common theme is discovery. Since Baby Rose is new to the world, whether it's Earth or just learning about her own powers, discovery plays a big role. Another theme is innocence. She is in a state of pure-hearted exploration, not yet jaded by the complex relationships and conflicts that come later. Growth is also a theme. We see her gradually evolving from a baby-like state to a more aware and self - determined being.
There could be a fanfiction where Baby Rose is taken care of by a particular Gem who acts as her mentor. This Gem teaches her about Gem history and culture, but Rose is more interested in the stories of Earth that she hears from afar. As she grows under this mentorship, she starts to question some of the traditional Gem beliefs, especially when she realizes how wonderful and diverse Earth is compared to the more rigid Gem society.
Baby Steven was in the garden. He saw a beautiful flower that was as big as he was. His eyes widened with wonder. He tried to touch it but his little hands couldn't quite reach. Pearl noticed and gently lifted him up so he could feel the soft petals. Steven babbled happily, his baby talk sounding like a sweet song. The other Gems gathered around, smiling at the adorable scene.
A simple plot could be Baby Steven getting lost in the woods near the Crystal Gem base. He encounters some friendly forest creatures who help him find his way back. As he wanders, he discovers new magical elements in the forest that the Gems didn't even know about.
Friendship is also a big theme. Even though Steven is a baby, the fanfictions show the start of a beautiful friendship between him and Garnet. Garnet is patient with him and they have these sweet moments together that build the foundation of their relationship. In some stories, Garnet teaches baby Steven about the world around them, which is a great display of their friendship.
Pearl is often very protective. She makes sure Baby Steven is safe from any harm, whether it's from outside threats or just him getting into things he shouldn't. For example, she might gently stop him from touching a dangerous Gem device.
Baby Peridot in the world of Steven Universe was a curious little thing. She had just emerged and didn't quite understand all the rules. Steven found her and was instantly intrigued. He brought her home and started teaching her about Earth. They went to the Big Donut together, and Baby Peridot was amazed by all the colorful treats. Steven explained what each one was. Later, they sat on the beach, and Steven told her stories about the Crystal Gems' adventures. Baby Peridot listened intently, her eyes wide with wonder.
There could be a plot where Baby Steven gets sick or injured in some way, and Pearl is extremely worried. She tries all her knowledge of Gem healing techniques, but since Steven is half - human, she has to figure out new ways to help him. She might seek advice from Garnet and Amethyst, and in the process, they all bond more closely as a family, with Pearl being especially protective of the baby Steven.
One great 'Steven Universe Baby Steven and Garnet' fanfiction is 'A Special Bond' which shows the really cute interactions between baby Steven and Garnet. It has some heart - warming moments where Garnet protects baby Steven.
A common theme is innocence. Since she's a baby amethyst, the fanfictions often explore her naivete and how she discovers the world around her. Another theme is growth. It shows how she develops her gem powers and her personality over time. Also, the relationship with the Crystal Gems is a big theme, like how they protect and guide her.