Baby Yoda is 50 years old. Big Yoda died in Return of the Jedi. Right at the end. The Mandalorian takes place between Return of the Jedi and The Force Awakens. The timeline is clear: Yoda is the illicit love child of Yoda and Yaddle, who was a member of the Jedi Council circa The Phantom Menace. This seems obvious to me. The timelines match up. It’s also peak Expanded Universe nonsense, so I’m sort of rooting for this theory to be true because it’s terrible, in a good way. What would make more sense is for Baby Yoda to just be a character completely disconnected from anyone in Star Wars as we know it, to make the universe seem broader in scope.