Windsor babies have come in a wide variety of sizes over the past century or so, as our graphic shows - from a tiny 4lbs 9oz to a new arrival at more than twice the weight.
The unusual facts people have been sharing about the Queen that may surprise you walesonline.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from walesonline.co.uk Daily Mail and Mail on Sunday newspapers.
To provide the United Kingdom with the monarch she felt it needed, Queen Elizabeth II sacrificed an ordinary life and the other things most of us take for granted.