Harry took a break from parenting today as he travelled to the Netherlands to launch the one-year countdown to the Invictus Games 2020.
He was met in the Hague by Princess Margriet and chairman of the games Mart de Kruif.
There were some shouts of congratulations from the crowds as the new father arrived.
The duke watched a wheelchair basketball training session in a sports hall at the Sportscampus building.
He shook hands and spoke to competitors, before hugging a young girl who presented him with a gift and letter.
The duke unwrapped the gift to reveal a blue and white baby’s cube toy decorated with rabbits. He was also given a babygrow bearing the Invictus Games logo.
In a short speech launching the games, he said: "I'm absolutely thrilled that many more wounded, injured and sick servicemen and women will have the opportunity to continue the journey to their recovery.
“Our mental fitness is the key because without we fail to operate efficiently, but with it your physical performance and potential are exponentially improved and we have witnessed this over and over again.”
Harry was then presented with an Invictus Games babygro for his son by Princess Margriet.
He drew laughs from the crowd by holding it against himself to model it.
The Invictus Games are an Olympic-style sporting event for injured ex-servicemen and women, founded by Harry in 2014.
Harry tried his hand at archery, joining in a session in the sports hall and firing an arrow at a target.
He hit close to the centre of the target and shook hands with the instructor.