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Following Charlie's birth on February 8, Tiger, 33, posted a message on his personal Web site announcing the news.
"Elin and I are thrilled to announce the birth of our son," Tiger wrote. "Both Charlie and Elin are doing great and want to thank everyone for their sincere best wishes and kind thoughts."
Charlie is the second child for the couple, who wed in October 2004.
Tiger hasn't played in a pro golf tournament since undergoing knee surgery in June 2008. While he is expected to return for the prestigious Masters in April, Tiger noted last month that his career hinges largely on his family.
"That takes precedent over anything I do golf-wise," he said.
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