Meghan Markle baby Archie could still face one huge royal restriction when he's older

Archie could be subject to a royal rule dictating he must ask the presiding monarch for permission to marry (Image: Getty Images)

One royal expert has claimed Meghan and Prince Harry's baby Archie could be subject to a royal law surrounding marriage, whether or not he decides to use his royal title.

According to a constitutional expert, the 2013 Succession of the Crown Act rule that royals who are sixth-in-line to the throne and above must ask the presiding monarch for permission to marry is likely to apply to Archie one day.