Sasuke's determination and focus can be passed on to their baby girl. He may set high standards for her in terms of her ninja skills (if in the Naruto - like universe). However, Sakura will be there to remind him that the baby girl also needs a childhood filled with love and play. Sakura's nurturing nature will ensure that the baby girl feels loved and cared for at all times, while Sasuke's more serious side will push her to be strong and capable.
Perhaps an old enemy of Sasuke's family, someone who holds a grudge against the Uchiha clan. They might see the new baby as a continuation of the Uchiha line and try to end it. This would put Sakura and Sasuke in a difficult situation where they have to use all their skills and the help of their friends to protect their baby.
There's 'Baby Uchiha's Adventure'. This one is more light - hearted. It follows the baby as it explores the ninja village with the help of its parents. There are cute moments like when the baby tries to imitate Sasuke's ninja moves, and Sakura is always there to cheer them both on.
One possible fanfiction could be about their baby inheriting Sasuke's Sharingan abilities. Maybe the baby shows early signs of these powers and Sakura has to figure out how to train the baby in both medical ninjutsu like her and also in the ways of the Uchiha clan. It could also show how Naruto interacts with the baby, being a close friend of Sasuke and Sakura. He might be like an uncle figure, teaching the baby some of his unique jutsu or life lessons.
In such a fanfiction, perhaps the story could focus on how Sakura and Sasuke adjust to parenthood. Maybe they face challenges like protecting their baby from old enemies who might target the new addition to the Uchiha family.
Their relationship would likely become more intimate and committed. With a baby on the way, Sasuke would feel a greater sense of responsibility towards Sakura. He might be more protective and stay closer to her.
One possible story could be that Sasuke returns to the village after his long journey. He and Sakura finally have time to be together. They discover they're going to have a baby. Sakura is both excited and a bit worried. Sasuke, though not very expressive, is secretly overjoyed. He becomes more protective of Sakura. As the pregnancy progresses, they start preparing a room for the baby. Sasuke might even go on small missions close to the village to get things for the baby.
Sasuke becomes more gentle. Usually he is cold and aloof, but with baby Sakura, he has to be soft. He shows more patience as he takes care of her needs, like when she cries and he tries to figure out what's wrong.
His personality could be a blend of introversion and extroversion. In some situations, he would be like Sasuke, preferring to be alone and train or study. But when it comes to protecting his friends or family, he would show an extroverted side, being vocal and taking charge, much like Sakura when she is in a leadership role. He would also have a great respect for the ninja way, having been brought up hearing stories from his parents about their adventures and sacrifices.
Since Sakura is a skilled medical ninja, the baby might also have an aptitude for medical ninjutsu. It could show an early interest in healing small wounds of its toys or pets. The baby might be able to combine the power of the Sharingan with medical ninjutsu, for example, using the Sharingan to better analyze internal injuries and then using medical ninjutsu to heal them more effectively.