The Duke and Duchess of Sussex had planned to travel back to the United Kingdom to see the Queen and the rest of the Royal Family, but the insider says, "Plans have changed" due to the coronavirus pandemic.
The Sussexes have been self isolating in their mansion in LA since the end of their final royal engagements came to an end last month.
Now, it seems a number of upcoming royal engagements will be cancelled with the duke and duchess not attending as a result.
This includes Archie's much anticipated first birthday.
Speaking to Eonline a soure said: "I think the hope in royal circles had been that the Sussexes would return to the UK in May, either before or after their attendance at the Invictus Games in The Netherlands next month.
Meghan and Harry were reportedly due to return to the UK for Archie's first birthday
It had been hoped Archie would reunite with the Duke and Duchess of Cambridge William and Kate, along with his cousins George, Charlotte and Louis
"They were also due to attend the Queen's Birthday Parade, Trooping the Colour on June 13," the sources explains.
"But with both those events now cancelled, and Harry and Meghan holed in California where they are likely to be social distancing for the next few weeks.
"Archie is set to celebrate his first birthday with only his parents."
According to the source, the royal couple had always planned to return to the UK.
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Harry and Meghan had planned to travel back to the United Kingdom to see the Queen and the rest of the Royal Family
It had been hoped Archie would reunite with the Duke and Duchess of Cambridge William and Kate, along with his cousins George, Charlotte and Louis.
The source added: "The hope had been that Archie's first birthday would
somehow be marked with some members of the royal family, cousins, grandparents and some godparents in the U.K. when they were over in the UK."
Despite being unable to meet with their family in Britain, the source says they "possibly" will celebrate Archie's birthday with Meghan's mother, Doria Ragland.
She resides nearby in Los Angeles and is close enough to meet with Meghan, Harry and Archie.
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According to the source, the royal couple had always planned to return to the UK
They 'possibly' will celebrate Archie's birthday with Meghan's mother, Doria Ragland
However, that's still undecided since it's unclear if there will be any restrictions in place in the state of California at the time of his birthday.
Regardless of how things unfold, the Duke and Duchess of Sussex will hold a gathering when appropriate.
This is even if it's not his exact date of birth.
According to the source, Archie's actual birthday "won't be the big first birthday celebration they have been planning, with friends, family and some godparents."
Royal Family tree
However, there is no doubt the Sussexes will be in touch with the rest of the Royal Family on the special day.
It's been reported that the Queen has began to keep in touch with her great-grandchildren through regular video chats.
A source told the newspaper that Cambridge children are using technology to show their appreciation for their great-grandmother while social distancing.
“Kate Middleton ensures that Prince George, Princess Charlotte and Prince Louis speak to the Queen, known as ‘Gan Gan’ and Prince Philip as often as possible,” the insider said.
The Duke and Duchess of Sussex will hold a gathering for Archie when appropriate
“The older two talk on the telephone or send chatty videos to Windsor.”
The goings on in the videos are left unsaid, but the trio also like to talk with their grandfather, Prince Charles.
Unsurprisingly, the conversation topics tend to revolve around the environment.
“They do like to chat away to Grandpa Charles and get lots of very helpful tips from him on animals and flowers, and speak to him about lambs, squirrels, [and] highland cattle.” the Sun’s source added.