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Duchess to miss Invictus Games opening due to morning sickness

The Duchess of Cambridge, who is suffering from acute morning sickness, will not attend the Invictus Games opening ceremony this evening or the athletics event tomorrow, Kensington Palace said.

Kate, who is expecting her second child, was also forced to cancel an engagement in Oxford earlier this week.

Meanwhile, David Beckham has given some friendly advice to the Duke and Duchess of Cambridge ahead of their new arrival - get some more sleep.

"With the commitments that they have to be a great mum and dad is pretty incredible," Beckham said.

There is already speculation that the royal couple's second child could be due in April.

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Bookies fancy second son for Kate and William

Prince George is likely to be joined by a little brother, according to the latest odds from bookies.

Prince George will soon be a big brother. Credit: PA Wire

Ladbrokes make it 4/5 that the Duchess of Cambridge gives birth to another boy in early 2015.

James is the early favourite to be the name of choice at 6/1, with Arthur and Victoria following just behind at 8/1.

Charles, Thomas and Alexandra are also high up in the odds.

Early predictions on Royal births are not always accurate - the odds on George were 10/1 prior to the future King's birth last year.

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