Didn't the immigrant visa take the birth certificate with you?

It's not that the immigrant visa didn't take the birth certificate. Materials to be prepared for an American immigrant visa interview: a valid passport. Birth certificate. Adoption contract (if applicable). Police notarial certificate (applicant1over 6 years old). Court or prison records. Service records. Two color photos with white background. Proof of economic guarantee. Notarial certificate of marital status (notarial certificate of unmarried, married, divorced and spouse's death). Original proof of kinship. Including: a household registration book listing all family members. Correspondence between the two parties. Pictures of the two sides together. Remittance receipt. List of telephone numbers contacted by both parties. School records signed by parents, etc.