Landing in Haiti to work on earthquake relief today with actor Sean Penn, Edwards told reporters, "I've said what I have to say for now and I'm here to help people."
"When the earthquake hit and I saw these images on television that you and people like you brought back to America, it was just heartbreaking, absolutely heartbreaking," he told Reuters news agency.
Edwards' wife, Elizabeth, whose own book caused a stir last year, told the Associated Press today "the whole family is relieved" by her husband's admission of his paternity.
She did not answer questions about their marital status and would not say where they will go in the future.
"If somebody has a crystal ball, they can let me know," said Edwards, who is still fighting breast cancer. "My marriage shouldn't be on anybody's radar screen except mine."
Edwards' lawyer Harrison Hickman told NBC today that Edwards has been visiting Quinn and paying child support for about a year. Edwards' wife, Elizabeth, learned last summer that Quinn was her husband's child.
In August 2008 Edwards admitted to the affair with Hunter but denied fathering the child in an exclusive "Nightline" interview with Bob Woodruff (WATCH THE INTERVIEW). Edwards said he repeatedly lied about the extramarital affair with Hunter, a 42-year old campaign employee, but strenuously denied he was involved in paying the woman hush money or fathering her newborn child.
Edwards categorically declared it was "not possible" that the baby was his.
"I know that it's not possible that this child could be mine because of the timing of events, so I know it's not possible," Edwards said. "[I'm] happy to take a paternity test, and would love to see it happen."
"Two years ago, I made a very serious mistake, a mistake that I am responsible for and no one else," Edwards said in the interview. "In 2006, I told Elizabeth about the mistake, asked her for her forgiveness, asked God for his forgiveness. And we have kept this within our family since that time."
Edwards, 56, said he told his entire family about the affair after it ended in 2006, and that his wife, Elizabeth, who has incurable breast cancer, was "furious" but that their marriage would survive. The couple have three children, Cate, 27; Emma, 11; and Jack, 9.
Months after the confession, Elizabeth Edwards wrote a book, "Resilience," in which she discussed her husband's affair. While promoting the book on "The Oprah Winfrey Show" in May, she said no paternity test had yet taken place.
But in the summer of 2009, the National Enquirer published reports that Edwards had taken a paternity test, and the results confirmed he was the father.
Hunter gave birth to Frances Quinn in February 2008, a month after Edwards ended his bid for the presidency. She listed no name for the father on the birth certificate, which created further speculation about who it might be.
Young originally claimed he was the father of Hunter's daughter, but Young -- who has two children with his wife, Cheri -- has since retracted that story and was expected to reveal more about the affair in the exclusive "20/20" interview Friday Jan. 29.
Edwards told ABC News in 2008 that he'd met secretly with Hunter in a California hotel room at her request because "she was having some trouble, she just wanted to talk."