Prince Harry: I can't wait to see my brother 'suffer more'

Prince Harry performs a traditional Maori 'hongi' greeting as he meets Ngati Ranana Maori Dancers during a New Zealand Invictus Team reception. Photo / Getty Images

Prince Harry said it was "very exciting news" that the Duke and Duchess are expecting a second child - although the notorious joker also quipped that he could not wait to see his brother "suffer more".

As he visited competitors training for the inaugural Invictus Games for wounded and injured soldiers, Harry said if the couple's second child is a girl he would "love to see him try and cope with that".

The new baby will be the fourth in line to the throne. He or she will not become a monarch, assuming the same role as Prince Harry.

He described Kate as "pretty poorly" but "doing the best she can", adding: "I hope the two of them have the opportunity to go through the process again with a little bit of peace and quiet."

And asked whether he could give the new baby any advice or "strategy" on being a younger sibling, he said: "There's never a strategy. I think George will be over the moon. I think he will be thrilled having another small younger brother or sister."

After welcoming teams from 13 nations competing in the games, Harry travelled to the Barking Sporthouse and Gym at Mayesbrook Park, Dagenham, to meet other competitors.

Meanwhile, The Duke of Cambridge today said he and his wife were "thrilled" to be having a second child - but admitted Kate has had a "tricky week or so" after falling ill with severe morning sickness.

Watch: Prince William: 'Thrilled' by second baby

Prince William was forced to attend an engagement in Oxford alone today because the Duchess was too unwell to come with him.

He said: "She's feeling okay. It's been a tricky few days - week or so - but obviously we're basically thrilled, it's great news, and early days. We're hoping things settle down and she feels a bit better."

Kensington Palace announced today that the Duchess was pregnant again. Kate, 32, whose son, Prince George is just a year old, is expecting her second baby with William next year.

The Queen and members of both families are delighted with the news that Their Royal Highnesses are expecting their second child

— The Prince of Wales and The Duchess of Cornwall (@ClarenceHouse) September 8, 2014

The Duchess is again suffering from the debilitating condition hyperemesis gravidarum, which causes extreme sickness in pregnant women - but William said she may be over the worst of it in a fortnight.

Unlike her first pregnancy, however, Kate is being treated by doctors at Kensington Palace and has not been admitted to hospital.

- Daily Mail