In addition, the Duke and Duchess of Cambridge chose to release an additional photograph taken from the day, and the public were never meant to see it.
Queen Elizabeth II and Prince Phillip were absent from the christening. Standing left to right: the Duke of Sussex, the Duchess of Sussex, the Duchess of Cornwall, the Prince of Wales, Carole Middleton, Michael Middleton, Pippa Matthews (née Middleton), James Matthews, James Middleton.
However, this photo of little Louis chuckling away was never meant to be seen by the eyes of the public, according to the Mirror.
The photos were taken at Clarence House, shortly after the christening ceremony at St. James' Palace.
The Cambridges also commissioned him to take the official birthday photographs of Prince George when he turned three in July 2016.
Louis was wearing a replica of the royal christening robe, made of fine Honiton lace lined with white satin, which was created in 1841 for Queen Victoria's eldest daughter, Victoria, the Princess Royal.
"I only hope I have captured some of that joy in my photographs".
The fifth-in-line to the throne looked peaceful in Kate's arms in all four portraits, while the typically shy and reserved Prince George had a big smile on his face.
The two-month-old was not the only royal family member who had a good time taking the pictures.
Another family portrait was taken which included the Duchess of Cambridge's family.