By what mechanism would a universe spontaneously create a new universe? As a human, can I spontaneously create anything simpler than me? Also, under what theor

By what mechanism would a universe spontaneously create a new universe? As a human, can I spontaneously create anything simpler than me? Also, under what theory of cosmology are you operating, and how do you determine when one thing is simpler than another? Under the Big Bang theory, the very early state of the universe (e.g. prior to initial nucleosynthesis) seems simpler to me than a galaxy.