Here's why Prince Louis wears 10-year-old gown at his christening

Prince Louis of Cambridge was christened at St. James's Palace on Monday and wore a 10-year-old Royal Christening Robe for the special occasion.

According to the official website of the British Royal Family, the robe is a replica of the original christening gown worn by Queen Victoria's eldest daughter in 1841.

The robe was used for all Royal christenings until ten years ago when Queen Elizabeth II ordered a replica from designer Angela Kelly in order for the original to be preserved.

The first Royal baby who was baptized in the replica was James, Prince Edward and Sophie Countess of Wessex's only son, in 2008. Read more on our Twitter, @amomama_usa.

True to tradition, Louis' older siblings - the 4year-old Prince George and 3-year-old Prince Charlotte, was christened in the same gown, as well as his cousin, Savannah Philips.

The original dress was made of white Spitalfields satin with delicate Honiton lace detail and was last worn in 2004 by Lady Louis of Windsor, as reported by USA Today.

It was worn by 62 Royal babies over 163 years, including five monarchs. Besides Queen Elizabeth, who was baptized in 1926, it was also worn by King Edward Vii, George V, Edward Viii and George VI.

Prince Charles and his two sons Princes William and Harry were also christened in the original robe, which is currently stored in the Tower of London with the crown jewels.

Prince Louis' christening was a private affair, and only close family members and his godparents were present.

It was attended by the Duke and Duchess of Cornwall, the Duke and Duchess of Sussex and several of Catherine's family members.

After the ceremony, guests attended a private tea at Clarence House where the christening cake - a tier from the Duke and Duchess of Cambridge's wedding cake - was served.