I don't know if i missed it somehow, but where in Fantastic Beasts: The Crimes of Grindelwald did Credence get the baby
from? Was there a scene where it came to him? Or did Grindelwald give/plant it to him?
This animal coming or being given to Credence makes a lot of difference to who Credence really is (him being from a certain family or him being manipulated by Grindelwald for his ulterior motives)!