A US citizen resident overseas can register the birth of a child by applying for a Consular Report of Birth Abroad (CRBA) at the nearest U.S. Embassy or Consulate, a crucial document proving their U.S. citizenship, often combined with a passport application through the U.S. Department of State portal MyTravelGov. This involves completing an online form (eCRBA), gathering documents like the child's local birth certificate and parent's ID/citizenship proof, then attending an in-person interview, with the CRBA serving as proof of citizenship for passports and other needs.

Following this procedure is even more important than filing a US tax return.