The organization said it had made the decision to begin basing enrollment in its boys-only programs on the gender a child or parent lists on the application to become a scout. The Boy Scouts had previously held a policy that relied on the gender listed on a child’s birth certificate for those programs.

The organization’s leadership had considered a recent case in Secaucus, New Jersey, where an 8-year-old child had been asked to leave her Scout troop after parents and leaders found out she is a girl. But the statement issued Monday said the change was made because of the larger conversation about gender identity going on around the country.

“For more than 100 years, the Boy Scouts of America, along with schools, youth sports and other youth organizations, have ultimately deferred to the information on an individual’s birth certificate to determine eligibility for our single-gender programs,” the statement said. “However, that approach is no longer sufficient as communities and state laws are interpreting gender identity differently, and these laws vary widely from state to state.”

Kristie Maldonado said she had mixed emotions Monday night when a representative of Boy Scouts of America called to tell her the organization would allow her faughter, Joe, to re-enroll in his troop after she was asked to leave last fall. Maldonado said she would like her daughter to rejoin the Secaucus troop, but only if the scout leader who made the previous decision leaves.

The Boy Scouts said the enrollment decision goes into effect immediately.

“Our organization’s local councils will help find units that can provide for the best interest of the child,” the statement said.

Zach Wahls, co-founder of the groups Scouts for Equality, called the decision historic.

“The decision to allow transgender boys to participate in the Cub Scouts and the Boy Scouts is an important step forward for this American institution,” he wrote in a statement posted to social media. “We are incredibly proud of Joe Maldonado — the transgender boy from New Jersey whose expulsion last year ignited this controversy — and his mother Kristie for their courage in doing what they knew was right. We are also proud of the Boy Scouts for deciding to do the right thing.”

Boy Scouts of America leaders lifted a blanket ban on gay troop leaders and employees in July 2015 amid intense pressure. The group had, after heated internal debate, decided in 2013 to allow openly gay youth as scouts.

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