The royal couple is in Poland with their children on a goodwill visit intended to seal friendly ties before Britain leaves the European Union.
On Monday, they met with Polish and British businesspeople, including Julia Sielicka-Jastrzebska, co-founder of the Whisbear company that makes whispering bears designed to help babies go to sleep.
They were offered the toys designed for newborns and as she handed the gifts to them, Middleton turned to her husband and said, “We’ll just have to have more babies.” They all laughed.
The royal couple is already parents to three-year-old George and two-year-old Charlotte.
Sielicka-Jastrzebska said Tuesday she was greatly impressed by the royal couple’s “openness” and keen interest.
The Poland trip marks the couple’s first visit to the country together.
On Tuesday, William and Kate started the day touring some of Poland’s historical sites, including the Stutthof concentration camp. They also met with survivors of the camp.
The family is headed to Germany next, where they will meet with Chancellor Angela Merkel, visit Berlin’s Brandenburg Gate and pay their respects at Berlin’s Holocaust Memorial.
—With files from the Associated Press