Meghan, the Duchess of Sussex and Prince Harry’s grandson Archie were born at 5:26 a.m. but Buckingham Palace didn’t announce anything about her birth until 2 p.m. that day, according to royal expert Robert Lacey.
Mr Lacey claims Prince William was angered by the released statement.
The Duke of Cambridge said the Sussexes had “deliberately misled” the public.
The Duke and Duchess of Sussex resigned their duties as senior royals earlier this year.
The couple moved to the United States at the start of the coronavirus pandemic.
They currently live in Montecito, California with their baby Archie.
When they announced their royal exit, the Sussexes had initially planned to split their time equally between North America and the UK.
READ MORE: Royal family LIVE: Meghan and Harry use 17-year-old Queen’s comments
Last month, the Sussexes attended a Time100 conference where the Duchess revealed how the family spends time together.
She said: “For us, we’re trying to make the most of all the quality time we’re spending with our son right now and not miss a single moment of his growth and development which has been really special. “
Prince Harry added: “There are a lot of things to focus on, a lot of work.
“But, as Meghan has rightly said, it’s an opportunity to spend more time with the family than we probably would otherwise. “
Last month, the couple also launched their new organization’s website Archewell.
It replaced their Sussex Royal Foundation which they scrapped after the Queen decided not to use royal in their future branding.
The landing page of their website displayed dictionary definitions of the words that make up Archewell.
It reads: “Ark… Greek word meaning“ source of action ”. Well… an abundant source or supply; a place where we will dig deep. ”
The Sussexes had previously said in a statement: “Before the SussexRoyal came the idea of ’Arche’ – the Greek word for ‘source of action’.
“We connected with this concept for the charity we hoped to someday build, and it became the inspiration for our son’s name. Do something meaningful, do something that matters.
“Archewell is a name that combines an ancient word for strength and action, and one that evokes the deep resources on which one must draw. We look forward to launching Archewell when the time comes. “