Additional required documents for minors under 20
Additional required documents for minors (under 20):Thailand tourist visas are valid for 90 days from the date the visa is issued; however, the duration of stay in Thailand is limited to 60 days.
• Birth certificate. A copy of the applicant's birth certificate.
• Letter of consent. A notarized letter of consent signed by both parents, specifying who will be traveling with the child and authorizing the Consulate to issue a visa to the child.
• Parents' passport copies. A copy of the information pages of both parents' valid, signed passports.
• Marriage certificate. A copy of parents' marriage certificate (if applicable).
Tourists wishing to stay for longer than 60 days will need to apply for an extension while in Thailand.