Kate Middleton follows a certain birthing rule that may apply to Meghan Markle as well.

The Duke and Duchess of Cambridge have welcomed all of their three children, 5-year-old Prince George, 3-year-old Princess Charlotte and 6-month-old Prince Louis, at the Lindo Wing of St. Mary's hospital. This is also where Princess Diana gave birth to Prince William and Prince Harry. Aside from this, they have a post-birth protocol that suggests that the couple wait for days before announcing the name of the newborn.

According to Kara Godfrey, a journalist for Express, Meghan Markle and Prince Harry might have to follow the same rule. The Duke and Duchess of Sussex may also have to wait for a couple of days before announcing the name of their baby.

Usually, Kensington Palace would announce the birth of each child and the gender on Twitter. However, the post would not reveal the name of the baby right away.

For instance, Prince George was born on July 22 and his name was only announced two days later. In addition, Princess Charlotte was born on May 2 and her name was announced on May 4.

However, the name announcement for Prince William and Middleton's youngest child took longer. The public waited for four days from his birth to learn that the baby's name is Prince Louis Arthur Charles.

According to reports, the reason for the delay was Prince Charles. The Prince of Wales was not able to meet the newborn right away as he had to travel to France to commemorate Anzac Day, which honors the fallen Australian and New Zealand veterans from WWI. Although the future king didn't have the chance to meet his youngest grandchild, he issued a warm welcome greeting to the youngest member of the Cambridge family.

"We are both so pleased at the news," Prince Charles said in a statement. "It is a great joy to have another grandchild, the only trouble is I don't know how I am going to keep up with them."

In related news, there is no truth to reports claiming that Prince Harry and Markle will leave the royal family for their baby. OK! magazine reported that the Duke and Duchess of Sussex are turning their backs to the monarchy as the duke "won't let my child end up like Diana." The publication added that Prince Harry would give up his title and his $150 million trust fund.

Gossip Cop debunked the report insisting that it wouldn't be wise for Prince Harry to do so. The Duke of Sussex "would neither have money to support his wife and baby nor a home anymore in Kensington Palace in which to shelter them." Also, Prince Harry and Markle have big roles in the monarchy. In fact, they just finished their Commonwealth tour.

Kate Middleton, Prince William, Meghan Markle and Prince Harry
Kate Middleton gave birth to her three children at the Lindo Wing of St. Mary's Hospital and waited for days before announcing their newborn's name, Meghan Markle may do the same. Pictured: Middleton, Prince William, Markle and Prince Harry attend as members of the Royal Family attend events to mark the centenary of the RAF on July 10, 2018 in London. Getty Images/Jeff Spicer