He weighed eight pounds seven ounces (3.83 kg) and is the third child of the Duke and Duchess of Cambridge.
In 2015, his sister Princess Charlotte was christened at St. Mary Magdalene Church in Sandringham, a royal estate near England's eastern coast.
Prince Louis' christening details have been revealed!
The service will be conducted by the Archbishop of Canterbury, the Most Reverend Justin Welby, who also baptized Meghan and officiated her nuptials to rince-ha.
Prince Louis was born on April 23.
At a christening already heavy with memories of Diana, Princess of Wales, the choice of Laura Fellowes confirmed predictions that the Duke would want a member of his mother's family to be a godparents.
Since his birth, we've all been waiting for our next glimpse of Prince Louis.
It comes after Charlotte donned a pink floral dress while joining Kate and brother George to watch William take part in a polo match last week.
The Queen, Prince Charles and the Duchess of Cornwall are set to attend. Understandably, the gown had some wear and tear, so babies since then have used a replica commissioned by Queen Elizabeth, pictured below on Princess Charlotte.
George was three months old when he was baptised, while Charlotte was only nine weeks.
Prince Louis's godparents will be expected to be announced on the morning of the christening, with William and Kate again likely to choose mostly close friends for the role.