Britain's Prince William, Duke of Cambridge and Britain's Catherine, Duchess of Cambridge on November 28, 2012.
- Catherine is in a central London hospital with acute morning sickness
- The birth would bring the first grandchild for Prince Charles and the late Diana
London (CNN) -- Britain's Prince William and Catherine Middleton are expecting their first child after 19 months of marriage, the palace announced Monday.
In photos: Duchess of Cambridge at 30
The royal revelation came as Catherine, Duchess of Cambridge, was admitted to a central London hospital with acute morning sickness. She is expected to be there for several days, the palace announcement said.
William and Catherine were married on April 29, 2011, in London's biggest royal wedding in three decades.
The baby would be the first grandchild for the heir to the British throne, Prince Charles, and the late Diana, Princess of Wales.
