The four official photos were taken at Clarence House in London after Louis was baptized in the chapel at St. James's Palace on July 9.
The images, taken by celebrity photographer Matt Holyoak, show Prince William and Kate posing with their three children - Louis, Princess Charlotte, 3, and Prince George, 4 - as well as with their wider family.
One shows Kate in a garden cuddling and gazing down at Louis, dressed in a frilly cream lace royal christening gown - a replica of the intricate robe made for Queen Victoria's eldest daughter in 1841.
Louis was born April 23.
Copyright 2019 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.