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The intergender match took place at Vila Ventura Ecoresort, Viamão, and was arranged to give the Selecao side some preparation for the upcoming Olympic football tournament in Tokyo.
There were two 30-minute periods and despite six-time FIFA best women's player and World Cup record goalscorer Marta featuring, it was the youngsters who emerged victorious through goals from Daniel (2), Nathan, Lucas Canigia and Hiago, as per reports.
Reflecting on the game, Brazil women's coach Pia Sundhage said: "This training game was important for several reasons, firstly, due to the challenge of playing speed in this male category, they are very fast.
"When we play in front of big teams, which are very fast, we will have this type of challenge.
"The game was also important for us to evaluate the players individually, we had some situations of one against one, protection of the ball, and how to react quickly in these situations. It is a good way to improve and be ready for the great challenges of 2021."
According to the official Gremio website, the Gremista girls (women's side) will play against the Brazil women's national team in another training game on 18 January.
Last year, a groundbreaking move in the Netherlands saw 19-year old female player Ellen Fokkema allowed to play for a senior men's side.
VV Foarut, who Fokkema has been with since the age of five, play in the fourth tier and were granted permission from the KNVB to carry out the experiment.
Dutch football association has given the green light to allow a female footballer to play in a senior men's team as part of a landmark pilot scheme. Ellen Fokkema, 19, has been granted dispensation by KNVB to play for 4th division amateur outfit VV Foarut next season. :ok_hand::clap: pic.twitter.com/icY8UwlVAH- Joel Khamadi (@Joel_Khamadi) August 4, 2020
Mixed football has been in place in Netherlands since 1986, with women able to play with men until the age of 19 - or in a category B men's team once they pass that age.