One interesting baby Ahsoka fanfiction could be about her early training days. Maybe it shows her struggling with the basic Jedi teachings in a really cute way, like trying to levitate a small object but accidentally making it fly all over the place.
One common theme could be family. The idea of Rex and Ahsoka starting a family and raising a baby brings in elements of love, protection, and new beginnings. Another theme might be the challenges they face, like how their Jedi and Clone Trooper backgrounds might affect their parenting.
One possible plot could be that Ahsoka discovers she has a baby through some unexpected circumstances, like the baby being left in her care by a dying friend. She then has to learn how to be a mother while still dealing with her Jedi duties and the threats in the galaxy.
Another option is that the father is a character from a different species or planet that Ahsoka met during her travels. Their encounter was brief but passionate, resulting in the baby.
You could also check out some Star Wars fan communities on social media platforms like Reddit. There are subreddits dedicated to Star Wars fanfiction. People often share their own works or recommend good fanfictions. You might be able to find some great baby Ahsoka fanfiction through the discussions and links shared there.
Some fanfiction might depict Ahsoka Tano as a baby being sent on a special mission by the Force itself. It could be a sort of prophetic journey where, even as a baby, she has to overcome challenges and meet certain individuals who will play important roles in her life later on. This would be an interesting take on her character's origin story.
I'm not sure of specific 'rex and ahsoka baby fanfiction' titles off - hand. But you can try searching on fanfiction websites like Archive of Our Own. There are often many talented writers who come up with interesting stories about different Star Wars characters and their relationships, including ones that might involve this concept.
One common theme is the struggle of parenthood. Given Anakin's fall to the dark side and Ahsoka's own journey of self - discovery, their child would face unique challenges. Another theme could be the child's power. Since both Anakin and Ahsoka are powerful Force - users, their offspring might have extraordinary abilities. And also, the theme of protecting the child from the dangers of the Star Wars universe, like the Sith or other threats.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of Star Wars fanfiction, and you're likely to find some great Ahsoka Tano baby fanfiction there. Just use the search function and type in relevant keywords.