When my kids were born, one of the first things we did was to bring them to the America Fukuoka Consulate to register their citizenship. An announcement from the American government:
Because of the State Department’s suspension of processing, we are currently unable to issue Consular Reports of Birth Abroad citizenship documents for infants and children. However, we can document the child’s citizenship with an emergency passport, and we strongly encourage families to apply for such documentation.
Seems strange that they cannot do the latter but can do the former. Americans with newborns should take note. - William