Harry and his wife Meghan Markle welcomed their first child, son Archie, in May.
"He loves children," Figueras went on. "I could always tell because we have been helping children in Africa for a long time. He always had this thing for children, so I knew he would be an amazing father. To see him become a father and see him so happy, it's an amazing thing."
Archie, who does not make regular public appearances, last popped up on his parents' South African tour, where he met Nobel Peace Prize winner Archbishop Desmond Tutu in Cape Town.