I know. Somewhere I had heard that the Man’s citizenship is what is transferred to the baby. I had also heard that the wife’s citizenship was determined by the husband. Turns out this is not completely true. The baby part is, but the wife part isn’t.
It was true in the United States prior to 1922. It was a determining factor at Marie Elg's birth in 1907, determining natural-born citizenship in Perkins v. Elg.
To what partial truth are you referring, as far as derivative citizenship being the law, at the time the Constitution was ratified, all the way through to 1922?