Originally Posted by
erik123
A child born on US soil to non-US parents who hold diplomatic status are not eligible for US citizenship - E.g. if dad is the ambassador in DC. I believe this is the only exception.
Per US treaty obligations, correct. At least that is the way it is supposed to be per policy -- however, in practice those children of foreign diplomats born in the United States who have a state-issued birth certificate can quite often acquire a US passport if they want by going through the normal process that natural born US citizens also pursue to get a US passport.