It would be much simpler to say that flesh means flesh and that is the baby and the "shall not divide assunder" refers to the typical child sacrifice.... but noooo, I go there and I am on the beach gettting ready to be kicked off the island! What's more Ez 16:8 refers to Yahweh making a covenant with the now grown orphan girl at essentially the same time as her "covering" but the actions are distinct from each other. Curious note though, ONE FLESH is not mentioned! V20,21 only later mentions slaying the children for passing thru the fire as was the practice for Molech.