Film of The Queen as a young child was released on Her Majesty's 84th birthday . This report of 21 April 2010 is from Sky TV News, UK.  

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The film shows The Queen – then Princess Elizabeth – when she was four.  According to the BBC, this is part of an exhibition at Windsor Castle. This includes a range of photographs, one taken just four days after her father unexpectedly ascended to the throne as George VI.

Curator Lisa Heighway told the BBC  the Princess' "serious expression" emerged once she became heiress to the throne.   She continues to be happy and carefree, but there's most definitely a serious expression there to be see.

The series of images include the first portrait sitting of Princess Elizabeth Alexandra Mary in December 1926. The pictures were taken by Marcus Adams, Royal Photographer between 1926 and 1956.

…life in transition…

 In this film, Mr Adams is seen entertaining the young princess by balancing coins on his forehead and nose. The BBC says that  the picture from December 1936  depicts a life in transition.

Just four days before the picture was taken, Elizabeth's father, then the Duke of York, ascended to the throne after the abdication of his brother King Edward VIII.

Ms. Heighway told the BBC that the change in Elizabeth is noticeable. "I think it is possible to see the difference," she said.  "In the early photographs she's a young, carefree and happy girl – she continues to be happy and carefree, but there's most definitely a serious expression there to be seen."

The exhibition at Windsor Castle opens on 24 April and runs until 6 February 2011.