1. LEGALIZED TRUE COPY
If in Singapore: notarized true copy legalized by the Ministry of Foreign Affairs (MFA) of Singapore. You can find more information on legalization on documents by MFA here: Legalisation of Documents

2. LEGALIZED/AUTHENTICATED OFFICIAL DOCUMENTS

• If the issuing country is member of The Hague Apostille Convention, the certificate must have the APOSTILLE SEAL produced by the central authority of the issuing country. You can find more information about it here : HCCH Members
• If the issuing country is NOT a member of The Hague Apostille Convention:
  • Singapore issued certificates: the certificate must be legalized by the Ministry of Foreign Affairs (MFA). You can find more information on legalization on documents by MFA here: Legalisation of Documents
  • 3rd countries issued certificates: a DOUBLE LEGALISATION procedure is required (1st by the issuing country and 2nd by the Embassy/Consulate of Spain in that issuing country)
• BIRTH / MARRIAGE CERTIFICATES issued by countries members of the CONVENTION ON THE ISSUE OF MULTILINGUAL EXTRACTS FROM CIVIL-STATUS RECORDS signed at Vienna on 8 September 1976, do not need APOSTILLE NOR LEGALISATION. You can check here the list of countries which are parties of the Convention on Multilingual Certificates
  http://www.ciec1.org/SITECIEC/PAGE_Accueil/fCgAAPAORB9DelVyWkFOVlJwAwA?WD_ACTION_=MENU&ID=A23
• OFFICIAL DOCUMENTS produced in any language different from English/French/Spanish, must be TRANSLATED either to Spanish or English and the translation duly legalized by the by Embassy/Consulate of Spain in that issuing country.

3. LEGALIZED PARENTAL AUTHORIZATION

• When parents in Singapore: parental authorization form must be signed by both parents before a local Public Notary and legalized by the Ministry of Foreign Affairs (MFA) of Singapore. You can find more information on legalization on documents by MFA here: Legalisation of Documents.html
• When any parent or both outside Singapore: parental authorization form must be signed and legalized before the corresponding Embassy/Consulate of Spain in the 3rd country.