Subject: Re: "Fetal personhood"
Clearly, "ensoulment" doesn't occur at conception. This has been known for a long time, for the reasons you explain.

And for like reasons, it can't be true that DNA alone makes a human unique, and thereby "endowed" with a unique "soul" (whatever that is). Consider human cloning. I don't think that process is perfected yet, but as soon as it is, every somatic cell of the trillions that make up a grown human has the potential to grow into a fully-formed human. And so, if a fertilized egg has a soul worthy of being granted full human rights, then so does every somatic cell.