The Duke and Duchess of Cambridge are expecting a baby.
St James's Palace made the announcement after Kate was admitted to the King Edward VII Hospital in central London with acute morning sickness.
The palace said she is expected to stay in hospital for several days. Prince William has been with her. The Duchess is not yet 12 weeks pregnant.
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The Duchess of Cambridge will be visiting the region on Wednesday without The Duke of Cambridge.
Following the death of his former nanny Olga Powell in September, Prince William will instead attend her funeral.
Mrs Powell is said to have played a significant role during his and Harry's childhood.
The Duchess of Cambridge will still fulfil the engagements as planned in Newcastle, Gateshead and Stockton.