Madonna also has two biological children, Lourdes and Rocco
Pop star Madonna may adopt another child from Malawi, she has told the country's newspaper, Nation.
The singer took baby David Banda from an orphanage in the region in 2006. His adoption was confirmed in 2008, despite some criticism from within the country.
Madonna told the paper that Malawian friends had suggested she adopt again.
"It's something I have been considering, but would only do if I had the support of the Malawian people and the Government," she said.
Writing in response to emailed questions from the paper's readers she said: "Many people — especially our Malawian friends — say that David should have a Malawian brother or sister."
Critics accused the Malawian government of sidestepping laws banning foreign adoptions in order to allow the celebrity to take 13-month-old David home with her.
After the adoption was legalised, Madonna said the difficulties had arisen because "this adoption essentially was the beginning of the creation of adoption laws in Malawi".
She hoped it would make it easier for others to adopt from the country and explained : "I am the template or the role model, so to speak, for future adoptions."
David's father, Yohane, placed him in an orphanage after the death of the boy's mother.
After the adoption was finalised, he told reporters: "I am glad it's all over, I am glad David has a new, good home."
The singer told Nation she was keeping her son in touch with his roots.
"It is a big priority for me to educate my son about the world, but always to stay connected to his Malawian culture," she said.
"He has a big map of Africa in his room with lots of arrows pointing to Malawi."
In the newspaper, Madonna was also questioned about her divorce from David's adoptive father, Guy Ritchie, which became final in November 2008.
She replied: "Everything between us is very amicable... We both agree that our children should always feel a deep connection with both their parents.
"It is our responsibility to give them that foundation."
Madonna made a documentary film I Am Because We Are about orphans in Malawi, a country where the Aids epidemic has left more than a million children without parents.
She described the impact of the media criticism she had received for removing David Banda from his home country as "painful" and "a big struggle".
"I sort of went through my own kind of birthing pains with dealing with the press on my front doorstep, accusing me of kidnapping, or whatever you want to call it," she continued.
The star also has two biological children - Rocco, her son with Guy Ritchie, and Lourdes, whose father is Carlos Leon.