Madeleine, the younger sister of Crown Princess Victoria, is fourth in line to the Swedish throne. She and O'Neill got married in Stockholm in June.
The palace said Tuesday that the pregnancy would not affect Madeleine's schedule this fall, or her work for the World Childhood Foundation, a nonprofit founded by her mother, Queen Silvia.
Sweden has a constitutional monarchy in which the royals primarily serve as figureheads. King Carl XVI Gustaf is the country's head of state, but his powers are limited to ceremonial duties.
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