"The Immigrant Visa Section at the U.S. Embassy would like to remind all of our visa applicants to bring their Birth Certificate Inextensa with them for their interview. All applicants, including applicants that will travel on the same petition in the future, must present their Birth Certificates Inextensa. Do not bring the extract of your Birth Certificate to the interview. Failure to bring your Birth Certificate Inextensa will result in delays in your visa processing." Source: https://do.usembassy.gov/applicants-must-bring-acta-inextensa-birth-certificates/