Prince William proved he makes a worthy uncle when he congratulated his brother on becoming a father.
Harry and Meghan Markle, the Duke and Duchess of Sussex, welcomed their son into the world at 5:26 a.m. on Monday, weighing 7 lbs and 3 ounces.
*UPDATE* The Duke and Duchess of Sussex revealed the name of their first child: Archie Harrison Mountbatten-Windsor. See the end of this article for the official announcement.
Both mother and son are well and recovering at their home at Frogmore Cottage in Windsor, accompanied by Markle's mother, Doria Ragland, who flew in from Los Angeles.
The Duke of Cambridge commented on the birth of his nephew, saying:
"Obviously thrilled, absolutely thrilled, and obviously looking forward to seeing them in the next few days when things have quietened down."
"I'm very pleased and glad to welcome my own brother into the sleep deprivation society that is parenting."
Watch his comments here.
Th Duke of Cambridge gave the dad joke a royal treatment, but Twitter roasted him for his effort.
Kate Middleton, the Duchess of Cambridge, added:
"As William said, we're looking forward to meeting him and finding out what his name's going to be so so it's really exciting for both of them and we wish them all the best."
The potential future queen consort left the jokes to William and cut right to the chase by wishing the new parents the best.
"These next few weeks are always a bit daunting the first time round so we wish them all the best."
When asked if William had any sage advice for his younger brother, the father of three–Prince George, 5, Princess Charlotte, 4, and Prince Louis, 12 months–said:
"Plenty of advice, plenty of advice, but no, I wish him all the best and I hope the next few days they can settle down and enjoy having a newborn in their family and the joys that come with that."
Elsewhere on the thread, one user pointed out that the Princes' mother would be proud.
Buckingham Palace did not release details of the exact location of where Baby Sussex was born, but it is believed the Duchess of Sussex gave birth in a private London hospital.
The royal baby is seventh in the line of succession after Prince Charles, Prince William, Prince George, Princess Charlotte, Prince Louis and Prince Harry.
Prince Harry told reporters that he and the new mother are still thinking of names, but the boy is already entitled to a title.
He will be known as the Earl of Dumbarton, the secondary Sussex title, as the eldest son who will eventually inherit the dukedom. And should the boy's great-grandmother, Queen Elizabeth II, so choose, he could be made a prince.
The public will have the opportunity to catch a glimpse of Baby Sussex when the Duke and Duchess present him to the public, scheduled for Wednesday.
You can relive the magic of Harry & Meghan: A Modern Royal Romance and Wedding available here.
The child's name was announced in a post on the official Twitter account on Wednesday.