Harry also had the opportunity to catch up with an old friend in the crowd, 98-year-old war widow Daphne Dunne, whom he proudly introduced to Markle.
It's a great pleasure to be able to visit this area now and be able to report back how much life has changed in the Great Western plains region since then, ' Prince Harry said in his speech at Dubbo's Victoria Park.
The Duchess of Sussex showed off her culinary skills and generosity by baking some banana bread for tea on the Woodley family farm outside Dubbo.
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"We have learned about the knock-on effect of the drought on the community and families, livestock and crop losses, financial hardship, job losses, concerns over the future and the lack of time forest and relaxation can take a huge mental and emotional toll on farmers and their families", said Harry.
Prince Harry battled the elements to thank the hundreds of residents for "welcoming me and my wife so warmly, and wet today".
As they arrived, it started to pour but that didn't stop the prince from addressing the crowd.
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"She's normally in bed at 10.30am but we had to stay up for this".
"You look incredible", the Duchess, 37, told the 35-year-old singer, before admiring the newborn.
Their first official engagement in Dubbo was at the dedication of a new plane for the Royal Flying Doctor Service.
They had a ideal start to their 16-day visit to Australia, Fiji, Tonga and New Zealand in Sydney on Tuesday. Prince Harry told the thousands who had come out to see the royal couple in Dubbo, about 300 km (185 miles) northwest of Sydney.
"You are all in this together and, if I may say, personally, we are all in this together - because asking for help was one of the best decisions that I ever made". They will be in Melbourne on Thursday.
Prince Harry introduced his favorite girl to his "favorite Aussie" during his first day of events in Sydney, Australia, with his pregnant wife, Meghan Markle.