Swedish royal lifestyle magazine Svensk Damtidning first reported that Madeleine revealed the gender of the new addition to the family while registering for a US baby website to create a baby shower gift list. They said she had also listed February 25 as the due date.
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"Our judgement is that this is correct and has been confirmed by her friends in New York," the magazine's editor, Karin Lennmor, told Swedish newspaper Aftonbladet.
Palace officals first declined to comment on the gender reports, but then Swedish Royal Court spokeswoman Ulrika Näsholm checked the information with Madeleine.
"The information is correct," she was quoted by website Svenskdam.se as saying, adding: "but Princess Madeleine does not want to comment further."