Meanwhile, Harry was overheard on Sunday suggesting he'd like a baby girl with Meghan.
During this tour, Meghan has ditched her classic high heels and opted for flats. It's understood she's not feeling sick but has been feeling exhausted.
The visit to Fraser Island off the coast of Queensland state took on a different tone, as the Duke of Sussex was greeted with a traditional Aboriginal ceremony from the local Butchulla people on the peaceful shores of Lake McKenzie.
"It's nice to see that Harry remembers me and he remembers the chats we've had".
The baby news was announced on the eve of the duke and duchess's first official visit outside the United Kingdom and Ireland.
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"Harry asked us which of our parents are in the military so we put our hands up", said Lincoln, 8, who was with his brothers Lachlan, 10, and Charlie, 6. The couple descended the stairs hand-in-hand, before going their separate ways: Harry boarding a bus and Meghan a vehicle.
Fraser Island's hardwood trees were used to build the London docks in the 1930s due to their famed toughness.
Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex cheer on sailers on Sydney harbour during day two of the Invictus Games Sydney 2018 at Sydney Olympic Park in Sydney, Australia, October 21, 2018.
'She wants to do everything, but Prince Harry is encouraging her to pace herself, ' the source added.
He'll also unveil a plaque to dedicate the popular holiday spot's 206,970 acres of pristine rainforests to the Queen's Commonwealth Canopy project. While the couple initially broke the news on Twitter, Harry chose to mention the same at the Invictus Games Opening Ceremony on Saturday.