This is the ValueSet that contains all the codes in BR Sexo Nascimento (https://terminologia.saude.gov.br/fhir/ValueSet/BRSexoNascimento) and BR Sexo Nascimento (https://terminologia.saude.gov.br/fhir/ValueSet/BRSexoNascimento). E.g. what you have to deal with if you get resources containing codes in either of them