Question: isn't yoda 900 years old?
Answer: In Star Wars: The Empire Strikes Back, Yoda is about 900 years old. (“When 900 years old, you reach… look as good, you will not!”) That means he's the same age when he dies shortly after training Luke. ... So, Baby Yoda isn't Baby Yoda, since regular Yoda would have been very much alive at that time.