Archbishop Justin Welby expressed his delight of presiding over the christening of Prince Louis and wrote on Twitter before the ceremony: "Please join me in praying for him and his family on this special day".
Guests included newlyweds the Duke and Duchess of Sussex.
As for why, the reason may boil down to a busy schedule.
This is the first time the Duke and Duchess of Cambridge appeared in public together with their three children.
He is also one of Queen Elizabeth's seven great-grandchildren.
Miss Middleton and Mr Pelly each read a lesson during the service, Kensington Palace said.
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Also spotted at the event were Middleton's parents, Carole and Michael.
Pippa confirmed last month that she was expecting in a guest column for United Kingdom supermarket monthly Waitrose Kitchen magazine, but she has yet to reveal whether she's having a boy or girl. For the anthems, the couple opted for "This is the day which the Lord hath made" by John Rutter and "Suo Gân", a traditional Welsh Lullaby by Gareth Wilson.
Prince Louis's christening gown is the same one that was used by his siblings. The robe is a family heirloom that dates all the way back to 1841, when Queen Victoria's oldest daughter wore it for her christening.
(L-R bottom row) The royals - Prince William of Cambridge, Prince Charles of Wales, Camilla of Wales, Kate Middleton of Cambridge, Prince Andrew of York, Princess Beatrice of York and Princess Eugenie of York - attended the wedding in full force in their fashionable best.
Louis, who was born on April 23, is the fifth in line to the British throne.
The christening took place at St. Jame's Palace in London on July 9.