We have baby universes nucleating. That is a consequence of the theory of inflation. Even if you take the cyclic one where the Big Bang expands, then the Big Crunch happens, then it goes back into a tiny die and then there's a Big Bang again,. might there be leftover matter from a prior Big Bang? Yes. But it can show disorganized to be as to be basically indistinguishable from matter created at the origin of our current observable universe.

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