But that doesn't mean the Duchess of Cambridge cares about the friendly competition—especially since one of Harry's stops on April 25 included a test to see how he would do changing his future niece or nephew's diaper!
"All the mothers will be, don't let me anywhere near the children," he joked as he practiced changing a doll's diaper while visiting Headway, a charity based in Nottingham that assists people suffering from brain injuries.
The Prince's mother, Diana Princess of Wales, was also involved with the charity for five years in the 1990s.
"This is actually how my brother is going to be," laughed Prince William as he struggled through the challenge.
Dominic Hurley, who was at the charity function, noted that Harry really only had one major issue while on diaper duty. "He was brilliant, except for the last bit when he put her on her front."
After his visit to Headway, Harry stopped by Russell Youth Club, a safe place for area children to hang out.
Despite his diaper fail, do you think Prince Harry will be the best uncle ever? Tell us in the comments section or on Twitter @OKMagazine