Meghan Markle celebrates Queen Elizabeth II's birthday in first public outing since baby Archie's arrival

The queen celebrated her birthday on Saturday.

It was Duchess of Sussex’s first public outing since she introduced her newborn son, Archie Harrison Mountbatten-Windsor, to the world in May.

It was the first Trooping for Prince Louis of Cambridge, who is just over a year old and is the third child of Prince William and Kate Middleton, Duchess of Cambridge. He was too young to take part in the 2018 parade, when he joined his family on the balcony. His cousin Archie, who is just over a month old, is too young to take part this year.

In a nod to their weddings, both Meghan and Kate wore outfits from the designers that created their wedding gowns — a butter-yellow coat dress by Alexander McQueen for Kate and a navy ensemble by Clare Waight-Keller for Meghan.

The Queen’s real date of birth is in April, but it is officially observed in early June so that it can coincide with the parade, and on a Saturday so that the public can attend.

The Trooping is heavily infused with military symbolism and significance. Different royals are in command of different regiments. The Prince of Wales is the royal colonel of the Welsh Guards; Anne, Princess Royal, is colonel of the Blues and Royals; William is colonel of the Irish Guards and Prince Andrew, Duke of York, is colonel of the Grenadier Guards. All colonels rode on horseback as part of the military procession.

The queen watched the ceremony from a dais in Horse Guards Parade, and inspected the troops before a 41-gun salute in Green Park and returning to Buckingham Palace.

The pinnacle of the event is the spectacular fly past from the Royal Air Force. More than 20 aircraft — both modern jets and older, historically significant planes took part, before the iconic Red Arrows made their finale, with streams of red, blue and white across the sky in the colors of the Union Jack.

The parade involved some 1,400 troops, with 200 on horseback, and several hundred musicians.