During their 16-day, four-country royal tour, Meghan and Prince Harry have 76 engagements scheduled, an itinerary that would be tiring for anyone.
The Duchess of Sussex was expected to attend the Invictus Games cycling events in Sydney, but pulled out because she was exhausted.
Eagle-eyed royal fans noticed that Meghan Markle wore the same dress as Prince Harry's ex-girlfriend, actress Jenna Coleman.
The Sussexes are now part-way through a 16-day tour of Australia, New Zealand, Fiji and Tonga, with 76 events on their schedule.
They will next travel to Fraser Island, off the coast of Queensland, with Monday's planned engagements including a visit to Lake McKenzie and a walkabout on the Kingfisher Bay.More news: Econometer: Is Trump's criticism of the Fed fair?
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The father-to-be also gushed about the couple's exciting baby news, which was announced hours after he and wife Meghan Markle landed in Australia earlier in the week.
According to Kensington Palace, Meghan has had her royal duties "slightly" trimmed as she and Harry prepare to continue their trip with stops in Fiji, Tonga and New Zealand.
"With the help of medical science, the Invictus generation has not only survived injuries that in past conflicts would have been fatal but have also chosen to fight back from the darkest of places to be here tonight", the Duke of Sussex said at the Opening Ceremony of the Invictus Games.
The Duchess is feeling fine but putting her health and baby first after a late night. In the afternoon the couple took to the seas to watch the sailing final at the Invictus Games.
Princess Anne, the Queen's second child, rejected royal titles for her children Zara Tindall and Peter Phillips, who have both kept a relatively low profile compared with their cousins, including the recently married Princess Eugenie. She wants to do everything, but Prince Harry is encouraging her to pace herself.
"You've all come together today to join together as a community to give testimony to that great Australian spirit about how we look after each other as mates", Morrison said in his address which was televised on the Australian Broadcasting Corp.