To be a U.S. citizen one must either be BORN a citizen or be naturalized as a citizen. There is no law for naturalizing anyone in utero.
You must have the one, before you can have the other. The requirement of conception is axiomatic, and therefore need not be specifically mentioned.
To be a U.S. citizen one must either be BORN a citizen or be naturalized as a citizen. There is no law for naturalizing anyone in utero.
There is no law because there is no need. Other than exercising the right to life, no other rights need be asserted. A person's citizenship is an integral part of the person. It is like eyes or hair color, an innate component of their existence.
A pregnant French woman becomes a naturalized US citizen. Then she goes to Mexico and gives birth to her baby. What country is her child a citizen of?