After the soldier fell, some rushed to his aid while the remainder of the Queen's Guard stood stone-faced, Mashable reported.
The Queen’s Birthday Parade, featuring 1,500 soldiers and 300 horses, was attended by the Queen and the royal family.
Britain's queen wows in green at 90th birthday parade
After the ceremony, members of the royal family, including Prince William and Kate with their children George and Charlotte, gathered on the balcony of Buckingham Palace to watch a military flypast.
This isn't the first soldier to faint in the presence of royalty.
On Friday a British Royal Air Force (RAF) serviceman fainted and was carried away by paramedics at St Paul's Cathedral shortly before the Queen arrived.
Queen marks 90th with huge birthday lunch in London
One of the reasons for the soldiers collapsing is the combination of a heavy uniform and warm temperature. It was 22°C in London on Saturday, yet the soldiers were supposed to look immaculate in their heavy uniform and bearskin hats.
Britain is holding several days of celebrations to mark the queen’s official 90th birthday, which began on Friday with a special service at St Paul’s Cathedral in London.
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