LONDON — Prince Harry and the former Meghan Markle, who is now known as the Duchess of Sussex, have finally announced the name of their baby boy.

Hours after giving the world its first glimpse of the newborn, the couple took to Instagram to share that they chose the name Archie Harrison Mountbatten-Windsor for their son. The announcement included a sweet photo of Meghan and Harry introducing baby Archie to Queen Elizabeth II.

"This afternoon Their Royal Highnesses introduced Her Majesty The Queen to her eighth great-grandchild at Windsor Castle," the post read. "The Duke of Edinburgh and The Duchess’ mother were also present for this special occasion."

Prince Harry and Meghan, Duchess of Sussex, introduce their son, Archie Harrison Mountbatten-Windsor, to Queen Elizabeth and Meghan's mother, Doria Ragland, at Windsor Castle on May 8, 2019. Chris Allerton / SussexRoyal via AP

Earlier Wednesday, Harry and Meghan said they were enjoying the "magic" of parenthood.

"It's magic, it's pretty amazing. I have the two best guys in the world so I'm really happy," the Los Angeles native and former "Suits" actress said as Harry cradled their son. "He has the sweetest temperament, he's really calm ... he's just been the dream."

"I don't know where he gets that from," Harry joked.

"Parenting is amazing," he added. "But we're just so thrilled to have our own bundle of joy and to spend precious time with him as he slowly, slowly starts to grow up."

The Duke and Duchess of Sussex with their baby son, who was born on Monday morning, during a photocall in St George's Hall at Windsor Castle in Berkshire on Wednesday. Dominic Lipinski / PA

Download the NBC News app for breaking news and politics

Asked which family member the baby most resembles, the couple said they were still trying to figure that out.

"His looks are changing every single day," Harry said. "He's already got a bit of facial hair!"

The couple were due to introduce the baby to Queen Elizabeth II and Prince Philip later Wednesday.

The baby was born at 5:26 a.m. Monday, with Harry at his wife's side. He weighed 7 pounds, 3 ounces.

Meghan’s mother, Doria Ragland, spent time with the couple at their home after the birth.

The newest member of the royal family is seventh in line to the throne, and Queen Elizabeth II’s eighth great-grandchild. He is not expected to have a royal title.

The baby arrived just short of a year after Harry and Meghan's star-studded wedding. They recently moved from Kensington Palace to their own home in Windsor, which is around 20 miles west of London.

Harry’s brother, Prince William, and his wife, Kate, announced Prince George and Princess Charlotte’s names two days after their births. They waited an extra few days to reveal Prince Louis’ name.

Prince Charles and Princess Diana waited a week to announce William's name.

Speculation on the royal baby's name began even before news of his birth hit the front pages.

Britain's media wondered if Harry and Meghan would keep with tradition and give their baby a royal family name or if they would chart their own course.

Before the announcement, the bookies’ top choices were Alexander, James, Arthur, Spencer, Philip and Albert.

William and Kate gave their children several names: George Alexander Louis, Charlotte Elizabeth Diana and Louis Arthur Charles.