(London, England) Prince William and Catherine, the Duchess of Cambridge, are expecting their first child, the palace announced Monday.
Middleton has been admitted to a central London hospital with acute morning sickness, and is expected to be there for several days.
The palace said her illness is hyperemesis gravidarum, which involves nausea and vomiting more severe than typical morning sickness.
“As the pregnancy is in its very early stages, Her Royal Highness is expected to stay in hospital for several days and will require a period of rest thereafter,” the statement said.
Catherine, 30, is not yet 12 weeks pregnant, Clarence House told CNN, so the palace is not announcing a due date for the child.
Prince William is at the hospital with Catherine, the palace says.