According to a PR expert, Meghan and Harry can give their children a choice, while Kate and William's children are not allowed.
Kate officially joined the royal family after marrying William in April 2011, and the couple already had three children. Their eldest son, George, was the third in line to the throne, after his father and grandfather.
After each child was born, William and Kate were photographed standing on hospital steps to show off the new members of the royal family.
Although children do not appear in public very often, they do make appearances at some of the royal family's events.
Children can often be seen waving to the Queen's annual royal parade on the balcony of Buckingham Palace, and royal observers have also caught a glimpse of children worshipping at Sandringham Church during the festival.
In addition, royal fans can often learn about the lives of their children through the conversations their parents have at the event.
It's also easy for the public to see William and Kate's children, as Kate publishes their latest photos on their birthdays.
Most recently, on George's 8th birthday last July, the little prince grinned as he sat on the hood of a Navy Blue Land Rover, one of his late great-grandfather Prince Philip's favorite off-road vehicles.
Meghan and Harry rarely share photos of their first child, Archie.
Their daughter Lilybert turned 1 year old in June. After the birth of the child, the couple posted only one photo of her.
However, PR expert Kinsey Schofield said they treat children differently, but Harry and Meghan don't mimic Kate and William's behavior.
She said: "I don't think they disapprove of the Duke and Duchess of Cambridge showing off their children's strategy because Prince Harry is well aware that the future of the children in Cambridge is very different from his own. ”
"This is because George, Charlotte and Louis are third, fourth and fifth respectively in the royal succession. Harry was sixth, while Archie and Lillibert were seventh and eighth, respectively. ”
Kinsey Schofield also said that as Cambridge children watched them grow up, the world "felt more connected to them".
"It's important for Prince William and Catherine's children to grow up before the world because if they do, the world will feel more connected to them," she said. ”
However, she claimed the same factors were "unimportant" to the Duke and Duchess of Sussex.
Archie and Lilibert, unlike their cousins, said, could choose whether or not to become public figures.
"It doesn't matter to Harry and Meghan, who want their children to choose whether or not to become public figures."