Kate Middleton to give birth in July

London: The Duke and Duchess of Cambridge are expected to become parents in July, the royal family said Monday.

The 31-year-old duchess is believed to be 13-14 weeks pregnant, the Daily Mail reported.

"Their royal highnesses, the Duke and Duchess of Cambridge are delighted to confirm they are expecting a baby in July," a St. James's Palace spokesman said.

The update also confirmed that Kate was expecting just one baby following speculation that she might be carrying twins.

Kate earlier fell ill in December when she became severely dehydrated. She was admitted to the King Edward VII Hospital in London and doctors diagnosed her with hyperemesis gravidarum, an acute form of pregnancy-related sickness.

Royal sources said it was "too early to say" where the baby would be born.

Queen Elizabeth's surgeon-gynaecologist Marcus Setchell will be monitoring Kate's pregnancy.

A spokesman declined to say whether the couple planned to find out the sex of the baby, although members of the royal family normally do not.