18 was too young,
INS rules at the time of 0’s birth said that for a us citizen mom to convey us citizenship to the child born outside the us, the mom had to have lived in the US for 5 years past the age of 14.
That would be 19, so Stanley Ann was too young (by almost 4 months).
I find it hard to imagine a very young woman leaving her family to go have a baby in a 3rd World Country in 1960.