It marked a moment the nation is likely to remember as a once-troubled boy undone by the death of his mother Princess Diana in 1997 auto crash seemed giddy in his embrace of fatherhood.
Meghan and Harry have been busy ever since changing traditions, bringing the dynasty more into line with modern tastes and that little bit closer to the people.
What began as a blind date for the two back in 2016 has evolved into a marriage, new royal titles and the start of a family for the husband and wife.
The royal infant, who will be seventh in line to the throne, was delivered in what appeared to be a home birth at the couple's new residence - Frogmore Cottage - in the grounds of Windsor's royal estate.
Buckingham Palace also said: "The duchess's mother, Doria Ragland, who is overjoyed by the arrival of her first grandchild, is with their Royal Highnesses at Frogmore Cottage".
The new royal baby is the first mixed-race baby born into the royal family in recent history, and Goldberg made note of that as well.
But the public had to wait more than a month for the Instagram post on May 6 announcing: "It's a BOY!"
Royal fans celebrate outside Windsor Castle in Berkshire after the birth of a baby boy to Prince Harry and Meghan Duchess of Sussex. Queen Elizabeth II, Prince Charles and Prince William were among the members of the royal family to have been informed and "are delighted with the news", it added. "3oz", Sussex Royal wrote.
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The Duke and Duchess of Cambridge, by contrast, had faced a mass photocall at the private Lindo Wing of St Mary's Hospital, Paddington hours after all three of their children were born.
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As late as last Friday, the signs of signing off on a deal looked promising, according to US Treasury Secretary Steven Mnuchin. The Wall Street Journal report said that Trump's tweet had taken Beijing by surprise.
But in recent weeks, speculation mounted that Meghan would chose a home birth. He says he is ecstatic about the birth of their first child and said more details will be shared in the coming days.
What happened after the birth?
The Duchess's half-sister, Samantha Markle, has also spoken out about the pregnancy, saying that she wants "Meghan to be happy and calm and have peace".
Despite the understated nature of Monday's announcement, some royal enthusiasts gathered in Windsor and at Buckingham Palace, where a framed notice of the birth went on display on a ceremonial easel placed on the forecourt.
Meghan gave birth at 5.26am on Monday May 6 United Kingdom time. She travelled to Morocco with Prince Harry for an audience with the king and became the patron of organizations including the National Theatre and Association of Commonwealth Universities.
He said it was a great thrill when he and his daughters met the royal couple when they came to Australia on their first worldwide tour after getting married.
What will the baby be called?
Thomas has not spoken to his daughter Meghan since she got married to Harry last May, although there has been correspondence by letter.