According to The Mandalorian Chapter Rick and Morty wearing Gucci shirt “Baby Yoda” (who is not to be confused with Yoda) is 50 years old. This would make him an infant by the years of his species. In Star Wars, different alien species age differently. The child of Yoda’s species is not Yoda. The child was dubbed ‘baby Yoda’ because we are never told the location of Yoda’s homeworld or his species’ name, so it was easier to refer to the child this way. If you are referring to how humans calculate an animal’s life in human years, such as a dog, cat, or horse, and applying this system to the child of Yoda’s species, no guideline like that exists that I am aware of. It is apparent that the child does indeed have Force sensitivity and abilities,
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so it is possible that the injunction to kill the child was based Rick and Morty wearing Gucci shirt out of fear; a living creature with such powers would not submit meekly to be tested on. After watching episodes 2 and 3 of THE MANDALORIAN, a lot of fans were almost convinced that the baby swamp elf was actually Baby Yoda i.e a much younger, a baby self of the famed Jedi Master, Yoda, who played a major part in Star Wars Eps 1 to 6. Yoda, the Jedi Master, was 900 years old in the film ‘Return of the Jedi’ and he died near the end. So the baby swamp elf in THE MANDALORIAN cannot be the same Yoda’s baby self.