Prince William, Kate Middleton and Prince George
Prince William, Middleton and Prince George leave Fairbairne Airbase as they head back to the UK after finishing their Royal Visit to Australia on April 25, 2014. Getty Images/Mark Nolan

They’re parents of three children these days and are known for trying to give their children as normal an existence as possible despite their status within the royal family. However, when Kate Middleton and Prince William became parents for the first time with Prince George, even they made a shocking mistake with their newborn infant son.

According to Mirror UK, when the Duke and Duchess did their official reveal of their first child on the steps outside the Lindo Wing, everything went well—until it came time for Prince William to put his son and heir into a car seat. When baby George was placed into the car seat, he was still swaddled in a blanket—something that is considered a major faux pas when it comes to buckling a child into one.

The website notes that it isn’t recommended for blankets and swaddles to be around the baby when they are buckled into the seat because they can keep the seat straps from staying the correct position. In addition, George’s arms were able to poke out from under the straps, which is another safety hazard.

Child car seat safety recommendations in the UK state that whether the seat is one that contains an integral harness or is a booster seat for an older child, that any straps should fit as tightly as possible for maximum safety.

Of course, the couple’s nerves as first-time parents were to blame for the incident, and when it came time to bringing both Princess Charlotte and Prince Louis home, things went much more smoothly.

Outside of that incident though, it’s noteworthy that despite the fact they will one day be the King of Queen Consort of England, and their eldest son will also be a future king, the Duke and Duchess of Cambridge try to provide as normal an existence for their kids as they can. Among the ways they do that are keeping Prince Louis, the most unlikely of the siblings to ever ascend to the throne, out of the spotlight as much as possible, and also by keeping the truth about the role he will one day have from George for as long as they can, allowing him to be a normal child now.

“With George, they are trying to delay that moment of realization and give him normality before they thrust this on him,” royal biographer Catherine Mayer told E! News at the time. “But it will be, nevertheless, part of his upbringing both in terms of what he sees his parents and grandparents doing and probably quite soon a beginning of an understanding that he is in public life and what that means.”