No, as a matter of fact, given that back then, we were sending diplomats all over Hell's half-acre, trying to build our standing as an independent nation in the eyes of other nations, and given that it took months just for those diplomats to get where they were going, I'm pretty sure our Founding Generation was pretty hip to the idea that US citizens could and would give birth to children off US soil, and still want to retain them to our own nation.
Oh, also, there was that whole "settlers moving West" thing happening. You may have heard about that. Do you really suppose that the Founders planned to repudiate the citizenship of those settlers' offspring simply because they were off fulfilling our "manifest destiny"? I'm gonna guess no.
In fact, I'm not even going to guess. I'm going to cite written law:
naturalization laws 1790-1795
SEC. 3. And be it further enacted, that the children of persons duly naturalized, dwelling within the United States, and being under the age of twenty-one years, at the time of such naturalization, and the children of citizens of the United States, born out of the limits and jurisdiction of the United States, shall be considered as citizens of the United States: Provided, That the right of citizenship shall not descend to persons, whose fathers have never been resident of the United States: Provided also, That no person heretofore proscribed by any state, or who has been legally convicted of having joined the army of Great Britain during the late war, shall be admitted a citizen as foresaid, without the consent of the legislature of the state, in which such person was proscribed.
That was passed three years after the Constitution was ratified, and two years after the Bill of Rights was subsequently ratified. It's like they were actually thinking about this shit, or something.
So yeah, apparently Congress DOES get to make laws defining who is a citzen at birth. Huh. Who'da thunk it? Oh, wait, I did.