The way Britain's royal family have announced pregnancy news has changed over time, so it's no surprise that Queen Elizabeth's announcement was very different from Kate Middleton's.

A royal's pregnancy is big news to the country, so the family usually has to make a formal announcement to the public. However, their approach in doing so has changed over the past several decades, Vogue noted.

When Queen Elizabeth II announced her pregnancy with Prince Charles in 1948 to the British media, the statement the palace issued was very formal and did not directly state that she was pregnant. "Her Royal Highness the Princess Elizabeth will undertake no public engagements after the end of June," the statement read, according to New York Times.

For Queen Elizabeth II's second pregnancy, Kensington Palace also did not directly state that she was expecting and there was no joyful language in the announcement. In fact, the monarch had apologized that she could not carry out the projected tour in West Africa that included a trip to Ghana, Sierra Leone and Gambia.

According to Vogue, baby news that revealed the queen's state or that she had sex was deemed improper. However, things changed around Princess Diana's time.

Princess Diana was warm and friendly, so it is no surprise that when she made her pregnancy known, her announcement was a little more cheerful. "The Prince and Princess of Wales, the Queen and the Duke of Edinburgh, and members of both families are delighted by the news. The princess is in excellent health," the statement the palace issued for her first pregnancy read.

Prince William apparently followed his mom's approach when he and wife Kate Middleton announced that they were expecting their children. However, the Duke and Duchess of Cambridge added their own spin by using social media. For instance, the couple broke the news of their third pregnancy via Twitter, which the publication noted was "the most informal royal pregnancy announcement in history."

When the palace announced that Prince William and Middleton are expecting, they also shared details about the Duchess of Cambridge's health condition, revealing that she was suffering from hyperemesis gravidarum. The same illness plagued her during her first and second pregnancies with Prince George and Princess Charlotte. In addition to this, Middleton canceled her royal engagements on the day of the announcement.

The Duchess isn't only missing royal engagements due to her condition. Middleton also did not get the chance to accompany her son Prince George on his first day of school at Thomas's Battersea. Fortunately, the Duke of Cambridge was there for their eldest.

Prince William and Prince George even posed for the latter's first day of school portrait. In the photo, Prince George looked confident and smart in his new uniform. He was all smiles as he held his dad's hand.

What can you say about the changes in the royals' baby news announcements over the years? Drop a comment below.

GettyImages-174293677 Kate Middleton's baby news announcement is very different from Queen Elizabeth's. Pictured: Pictured: Middleton and Prince William depart The Lindo Wing with their newborn son, Prince George, at St Mary's Hospital on July 23, 2013 in London. Photo: Getty Images/Chris Jackson