Kate Middleton, Britain’s Duchess of Cambridge, and husband Prince William are expecting a third child, a statement from Kensington Palace disclosed on Monday.

“Their royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their third child,” the statement read.

“The Queen and members of both families are delighted with the news.”

The statement further said Middleton has hyperemesis gravidarum, a condition associated with pregnant women.

It read: “As with her previous two pregnancies, the Duchess is suffering Hypermesis Gravidarum.

“Her Royal Highness will no longer carry out her planned engagement at the Hornsey Road Children’s Centre in London today.

“The Duchess is being cared for at Kensington Palace.”

Middleton and William are already parents to two children, Prince George and Princess Charlotte.

What is hyperemesis gravidarum?

Hyperemesis gravidarum is worse than regular morning sickness. It is characterised by fatigue, severe nausea, vomiting, and weight loss.

Patients suffering from hyperemesis gravidarum may also experience sleep disturbance, depression, anxiety, irritability, mood changes and decreased concentration.

The symptoms often ease up after the 20th week of pregnancy but in some cases, they may last the entire pregnancy.

Mild cases of the condition are treated with dietary changes, rest, and antacids.

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