London (CNN) The world finally has its first glimpse of Prince Harry and Meghan's newborn son, and his name is Archie Harrison Mountbatten-Windsor.

The Duke and Duchess of Sussex appeared in front of selected media behind closed doors on Wednesday, cradling their first child, who was was born at 5:26 a.m. Monday morning, weighing 7lbs 3oz.

The couple then shared their chosen name on Instagram with an image of Queen Elizabeth, the Duke of Edinburgh and Meghan's mother meeting their newest great-grandchild.

Harry said becoming a parent was "amazing" as he held his son in his arms. "We're just so thrilled to have our bundle of joy. We're looking forward to spending some precious time with him as he slowly starts to grow up," he said.

Meghan said their son has the "sweetest temperament." "It's magic, it's pretty amazing. I mean I have the two best guys in the world. So I'm really happy," she gushed.

The child, whose name has not yet been revealed, is seventh in line to the throne.

Queen Elizabeth II was expected to meet her new great-grandchild and his parents on Wednesday, a source familiar with the plans said. The source asked not to be named discussing the family's private lives.

The palace would not confirm on Monday where the baby was delivered but said Harry had been by his wife's side. The child, whose name has not yet been revealed, is seventh in line to the throne behind Prince Charles, Prince William and his three children, and Prince Harry.

The couple ultimately kept the details of the pregnancy under wraps after announcing they were expecting a baby last October, in line with their repeated requests for privacy since they began dating years ago.

An emotional Prince Harry addressed the press outside Windsor Castle after Meghan gave birth and said that he was "over the moon" and "incredibly proud" of Meghan.

"How any woman does what they do is beyond comprehension, but we're both absolutely thrilled and so grateful for all the love and support from everybody out there," Harry gushed.

Photos: Royal romance: Harry and Meghan Britain's Prince Harry and Meghan, Duchess of Sussex, attend the annual Commonwealth Day service at London's Westminster Abbey on March 9. This marked the couple's final engagement as senior members of the royal family. Hide Caption 1 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry attend the Endeavour Fund Awards in London on March 5. Hide Caption 2 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry visit the Canada House in London on January 7. The couple announced the next day that they would be stepping back from their roles as senior members of the British royal family. Hide Caption 3 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry visit a community center in Windsor, England, in November 2019. Hide Caption 4 of 32 Photos: Royal romance: Harry and Meghan The couple attends the annual Festival of Remembrance in November 2019. Hide Caption 5 of 32 Photos: Royal romance: Harry and Meghan Harry and Meghan attend a pre-ceremony reception for the WellChild Awards in October 2019. Hide Caption 6 of 32 Photos: Royal romance: Harry and Meghan Meghan is photographed during a royal tour of South Africa in October 2019. Hide Caption 7 of 32 Photos: Royal romance: Harry and Meghan Archbishop Desmond Tutu kisses Archie, Meghan and Harry's son, in September 2019. Hide Caption 8 of 32 Photos: Royal romance: Harry and Meghan Harry and Meghan dance during their royal tour of South Africa in September 2019. Hide Caption 9 of 32 Photos: Royal romance: Harry and Meghan Meghan holds Archie during the South African tour. Hide Caption 10 of 32 Photos: Royal romance: Harry and Meghan Harry and Meghan greet singer Beyoncé and her husband, rapper Jay-Z, as they attend the European premiere of the film "The Lion King" in July 2019. Hide Caption 11 of 32 Photos: Royal romance: Harry and Meghan New York Yankees manager Aaron Boone presents the couple with a jersey for Archie before a Major League Baseball game in London in June 2019. Hide Caption 12 of 32 Photos: Royal romance: Harry and Meghan Queen Elizabeth II looks at her new great-grandchild, Archie, in May 2019. Prince Philip is on the far left. Meghan's mother, Doria Ragland, is next to her at right. Hide Caption 13 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry present their newborn son at Windsor Castle in May 2019. Hide Caption 14 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry walk past tapestries during a visit to Rabat, Morocco, in February 2019. Hide Caption 15 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry attend a Christmas Day church service in December 2018. With them, from left, are Prince Charles; Prince William; and William's wife Catherine, the Duchess of Cambridge. Harry and William are the two sons of Prince Charles and the late Princess Diana. Hide Caption 16 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry cheer on sailors during the Invictus Games in Australia in October 2018. Hide Caption 17 of 32 Photos: Royal romance: Harry and Meghan The couple talks to members of OneWave, an awareness group for mental health and well-being, in Sydney in October 2018. Hide Caption 18 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry pose with the cast and crew of the musical "Hamilton" after a performance in London in August 2018. Harry gave those in the theater something to remember after breaking into mock-song at the end of the show. The show was held to raise money for his HIV charity, Sentebale. Hide Caption 19 of 32 Photos: Royal romance: Harry and Meghan Members of the royal family watch a flyover during a July 2018 event marking the centenary of the Royal Air Force. From left are Prince Charles; Prince Andrew; Camilla, the Duchess of Cornwall; Queen Elizabeth II; Meghan, the Duchess of Sussex; Prince Harry; Prince William; and Catherine, the Duchess of Cambridge. Hide Caption 20 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry attend the Royal Ascot horse races in June 2018. Hide Caption 21 of 32 Photos: Royal romance: Harry and Meghan The couple poses with family members after getting married in May 2018. Hide Caption 22 of 32 Photos: Royal romance: Harry and Meghan Just after getting married, the newlyweds wave during their carriage procession in Windsor, England. Zoom in for a closer look Hide Caption 23 of 32 Photos: Royal romance: Harry and Meghan The couple watches Coach Core apprentices take part in a training exercise in Birmingham, England, in March 2018. The Coach Core apprenticeship scheme was designed by the Royal Foundation to train young people to become sports coaches and mentors within their communities. Hide Caption 24 of 32 Photos: Royal romance: Harry and Meghan Harry and Meghan join Prince William and Catherine, the Duchess of Cambridge, during a Royal Foundation Forum in February 2018. Hide Caption 25 of 32 Photos: Royal romance: Harry and Meghan The couple watches a dance class during a visit to Cardiff, Wales, in January 2018. Hide Caption 26 of 32 Photos: Royal romance: Harry and Meghan The couple meets well-wishers during an appearance in London in January 2018. Hide Caption 27 of 32 Photos: Royal romance: Harry and Meghan A shop worker in Windsor, England, adjusts memorabilia celebrating the engagement of Harry and Meghan. Their engagement was announced in November 2017. Hide Caption 28 of 32 Photos: Royal romance: Harry and Meghan Meghan flashed her engagement ring to reporters during a November 2017 photo call. The ring, designed by Harry, featured a large diamond from Botswana and two smaller outer diamonds from the personal collection of Harry's late mother. Hide Caption 29 of 32 Photos: Royal romance: Harry and Meghan This engagement photo was released by Kensington Palace. Hide Caption 30 of 32 Photos: Royal romance: Harry and Meghan Meghan and Harry made their first public appearance as a couple at the Invictus Games in Toronto in September 2017. The pair were introduced in July 2016 by mutual friends in London. Hide Caption 31 of 32 Photos: Royal romance: Harry and Meghan Harry and Meghan embrace at a polo match in May 2017. Hide Caption 32 of 32

In a significant milestone both across the Commonwealth and within British society, the newborn has made history by becoming the first biracial British child in the royal family. It's not the first trailblazing moment for the new royal couple, following their wedding ceremony last May that seemed to make a statement at every turn. In a striking image, the outspoken American divorcée walked unescorted down the aisle followed by her 10 bridesmaids and page boys. The couple then listened to the stirring, soulful address by Bishop Michael Curry, the first African-American head of the Episcopal Church in the United States.

JUST WATCHED Prince Harry says he's 'over the moon' for his son Replay More Videos ... MUST WATCH Prince Harry says he's 'over the moon' for his son 01:47

His impassioned speech was then followed by a performance of the Ben E. King classic "Stand by Me" by The Kingdom Choir, a group of 20 gospel singers.

The couple also announced the royal baby was a boy on their official Instagram page, hours before the ceremonial easel was placed at the forecourt of Buckingham Palace in London.

The bulletin read that Queen Elizabeth II and the Royal Family were "delighted at the news that Her Royal Highness The Duchess of Sussex was safely delivered of a son."