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Mongolia’s civil-registration law treats a sex change as something a hospital must verify before the register can be updated. That is an adult identity-paper rule, not a pediatric puberty-blocker or hormone protocol. No official pediatric medical policy is listed.
The Law of Mongolia on Civil State Registration (revised edition, 21 June 2018) Article 14: a citizen over 18 who wants to register a sex change must apply in person with an identity card, birth certificate, and a medical verification document on the sex change. Registrars record that change within seven working days.