Catherine is “edging herself back” into doing more overseas visits following her cancer treatment, the prince said.
However, he cautioned that royal trips take their toll, so the Royal Family have to “make sure she’s OK and rested”.
“She’s been through so much in the last couple of years, particularly. She’d been looking forward to the Italian trip a lot, and so I’m really glad it went really well,” he added.
The princess received an enthusiastic welcome from crowds in the Italian city of Reggio Emilia.
The city was chosen as the destination for her trip because of its support for children’s first years and its emphasis on early relationships and learning through play.
“She wanted to go and do lots of research; she spends God knows how much time now looking through all the paperwork,” William said.
“She’s a proper pro on early years, and so most evenings I’m fighting to get past in the bedroom… all the paperwork that she’s got lined up ready to read,” he added.
In January of last year, Catherine said that she was in remission from cancer, which had been diagnosed in 2024.