I know that there are many different theories of personal identity, such as the embodied mind theory, the psychological continuity theory of identity, etc.
Is there an account of personal identity that would support an identity relationship between a fetus, and its future developed self, while denying an identity to a zygote and to any other beings that lack certain traits or the potential to ever develop them?
These would seem to me to be the traits of a consistent theory of identity, however I've been unable to find one that would meet the criteria I describe. Is there a known theory of identity that does?