Joe Maldonado wanted to join the Boy Scouts because many of his friends were a part of it. The eight-year-old went to school with the boys in the group, hung out with them and played on the basketball team with some of them, said Kristie Maldonado, his mother.

But about a month after joining Pack 87 in Secaucus, New Jersey, Joe was asked to leave because he is transgender, according to Kristie Maldonado. His case is believed to be the first known in which a scout was rejected based on their gender, Justin Wilson, the executive director of Scouts for Equality, told NorthJersey.com.

“Because he wasn’t born a boy, he was no longer able to go back into the Boy Scouts,” Maldonado told the Guardian.

Maldonado said she was unaware of any issues with her son until she received a call from a scouting official, asking whether Joe was born a girl. “At first, well, I didn’t answer him. I just said, you guys didn’t ask for a birth certificate. I said no one had ever seen my child naked,” she said.

The call came as a surprise to Maldonado because Joe was open about his gender identity and had been accepted as a boy at school. The other kids in the troop had never had an issue with him, Maldonado said.

But the official told her that some parents had mentioned Joe’s name had previously been Jodi, and that Joe could no longer be a part of the troop, Maldonado said.

“If they had said right from the beginning, because I know it’s a touchy subject and I know it’s a private organization, I would have said, OK, we can’t join. We can’t do it this year. I would have made an excuse for Joe,” she said, “But you don’t accept a child, then a month later you throw them out.”

The Boy Scouts of America endured years of controversy before ultimately lifting bans on gay scouts and leaders in recent years. Maldonado said she took this as a sign that her son would be allowed to join. “I took it as, OK, if they’re accepted, why not transgender?”

But a spokeswoman, Effie Delimarkos, said in a statement the organization considered transgender children as a separate issue.

“No youth may be removed from any of our programs on the basis of his or her sexual orientation,” she said, but added: “Gender identity isn’t related to sexual orientation.”

The Boy Scouts declined to directly address Joe’s situation or say whether there was a written policy on transgender participants. The statement said Cub Scout programs were for those identified as boys on their birth certificates.

Wilson told NorthJersey.com that the Boy Scouts of America organization was not known to have rejected any scouts due to gender identity prior to Joe’s case. He knew of at least two transgender boys who were Cub Scouts in other states and did not know of any instances in which scouts were asked for birth certificates as a condition of membership.

Eric Chamberlin of the Northern New Jersey Council of Boy Scouts acknowledged having called Maldonado last month, NorthJersey.com reported. He declined further comment and referred questions to the scouts’ national office, saying the issue involved “our membership standards”.

Earlier this year, the Boy Scouts told the Associated Press that it would admit transgender children to its coeducational programs, but not to programs that are for boys only, like the Cub Scouts and Boy Scouts.

By making the family’s story public, Kristie Maldonado is also hoping for change. “The change is I want for them to go not by birth certificate or what they’re born with, but go by their identity. Our definition of identity is how you feel,” Maldonado said. “When they say identity, they’re going by the birth certificate.” She wants transgender kids to be included, “no questions asked”.

The national Girl Scouts organization, which is not affiliated with the Boy Scouts, has accepted transgender members for years.

The Boy Scouts did not respond to questions about whether the group would accept a transgender girl whose birth certificate indicated she was assigned male at birth.