Prince Harry will have to brush up on his nappy-changing skills before he becomes an uncle later this year.
The Prince was tasked with changing a diaper with one hand as part of a workshop to show the effects that brain injuries can have on everyday tasks.
He struggled to fasten the sides of the nappy and joked: "This is exactly how my brother is going to be."
As photographers snapped away, he added: "All the mothers will be saying 'Don't let him near the children'."
Harry was visiting Headway's headquarters in Nottingham - a charity that Diana, Princess of Wales, was the royal patron for between 1991 and 1996.
Headway works across the UK to support people who have suffered brain injuries and their families.
Dominic Hurley, who was just 21 when he suffered a life-changing brain injury in a moped accident in 1994, watched Harry's nappy-changing attempts.
Mr Hurley, 40, lost the feeling down one side of his body following the accident and had to change his daughter Nina's nappy with one hand, just as the Prince attempted today.
"I think he did a brilliant job, especially as it was the first time he had tried it," Mr Hurley said.
Harry also met double Olympic gold medallist and Headway vice president James Cracknell and Sergeant Johnson Beharry, who have both suffered the effects of brain injuries.
Read: Prince Harry visits brain injury charity