The prince joked that he has been able to avoid changing his daughter Princess Charlotte's diapers during a week of royal duties

By Simon Perry
Updated May 22, 2015 10:15 AM

The new dad, 32, has been busy with a series of royal engagements culminating in a glamorous bash for a favorite conservation charity on Thursday, where he joked that he has missed out on a key chore with three-week-old daughter Princess Charlotte.

“He said that he was delighted and all is going well,” his friend, Tusk Trust CEO Charlie Mayhew, tells PEOPLE. The conservation group was feted by royal patron William at Windsor Castle on Thursday evening. “He was having a week off from nappies, as he’s been in London all week.”

Of course, Princess Kate is not without help at home in the country with Charlotte and Prince George, 22 months, as she has a nanny, housekeeper and likely her mother Carole, 60, to lean on.

But she will have missed the excitement and fun of the party in St. George’s Hall at Windsor that marked Tusk Trust’s 25th anniversary. William, who gave a stirring speech, was “on good form,” Mayhew tells PEOPLE. “His main message being that the time for words is over and we have to act urgently.”

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The party wasn t a fundraiser, but in the room were people who have helped the charity’s anniversary appeal make $3 million towards a target of $7.5 million.

William “has almost single-handedly raised the profile of this issue and been proactive,” says Mayhew.

“I can’t think of anybody in the space of a matter of a few months who has managed to have face-to-face meetings with President Obama and President Xi Jinping of China to discuss the issue of illegal wildlife trade,” he adds.

One day, the prince will undoubtedly inspire his children in the fight for wildlife. “Becoming a parent has re-evaluated his outlook on life and makes him even more determined to ensure that we leave the planet and the natural world to the next generation hopefully in a better state than we have it,” Mayhew notes

“I’m sure he will want to take the children to Africa at some point – but not for a while yet.”

For more royal photos and all the details on Will and Kate’s growing family, pick up People’s Princess Charlotte collector’s edition, in stores May 15. Or download the digital version at