In general terms, every child born in Brazil is considered of Brazilian origin, even its parents are foreigners. However, when the parents are at the service of their foreign country, the Jus Soli rule does not apply.
How to proceed when a child of foreign parents is born in Brazil?
In bureaucratic terms, there is no different rule for children born in Brazil to Brazilian parents or foreign parents. In both cases, the parents must present their identification document, with photo. Married parents must show their marriage certificate.