Recommended Practice based on International Guidelines
All births should be registered, including those of a foundling (a child who has been abandoned and whose parents are unknown.) Generally, the person or the head of the institution that assumes custody of the infant should be responsible for notifying the registrar of the birth. The person reporting the birth should provide: date and place of finding, sex, approximate birth date of child, name and address of person/institution reporting finding, name given to the child by the custodian of the child, and any other information requested by registrar. The entry should be marked as "foundling" (or similar) and information about parentage left blank. If child is later identified, the foundling registration should be voided and placed under seal
Indonesia
Legal Analysis
The person who found the child must report to the birth, together with a police report. The law is silent regarding the nationality determination for the child.
Law Source