Dressed in blue Rachel Riley dungaree shorts with a ship on the front, a white blouse and soft blue shoes, George was seen playing with (or should that be stealing) the other children's toys.
Kate and Wills watched on as they chatted with the other parents. "It's madness," said William, "There are babies everywhere!"
Parents Grant Collins and Magda Gurbowicz met the royals with their baby son Lucas and asked how the young family was coping with jet lag.
"We chatted to the Duke first and asked about how they and George coped with the jet-lag," said Grant.
"William said sleeping and distracting [the baby] was the best thing to get over jet-lag and that's what they'd done with George. We spoke to the Duchess about group play - George had never played with so many babies before.
"She said it was the most amount of babies they'd ever had in a room with George."
See all the pictures from the Royal Tour so far in the gallery below.
Watch The Duke, Duchess and Prince of Cambridge landed in New Zealand on Monday...