Sarah found that Princess Madeleine wore a Roksanda dress to Prince Oscar's christening on May 27, 2016. 

Madeleine, carrying her eldest child Princess Leonore, entered the chapel with her cousin Oscar Magnuson (the son of Princess Christina) and Prince Daniel's cousin Hans Åström.

Prince Oscar was christened in the Royal Chapel of Stockholm Palace. The ceremony was conducted by Archbishop Antje Jackelen. His godparents were his maternal aunt, Princess Madeleine; maternal 4th cousin and close friend, Crown Prince Frederik of Denmark; Crown Princess Mette-Marit of Norway; maternal cousin, Oscar Magnuson; and paternal cousin Hans Åström. 

Crown Prince Frederik and Crown Princess Mette-Marit both delivered readings during the ceremony. 

Princess Madeleine helped her niece, Princess Estelle, pour the water for the christening into the christening font. Leonore appeared a bit jealous that her mother was holding her cousin Estelle, and so, Crown Princess Victoria stood up to hold her niece while the water was being poured. 

In one comical moment, little Leonore turned around in her chair while one of the soloists was singing. Unfortunately, she leaned a little too far back and knocked the chair and herself over. 

Oscar wore the traditional christening gown which was originally worn by Prince Gustaf Adolph (later King Gustaf VI Adolph) in 1906. His name and the date of his christening were sewn in to the gown, as per tradition. 

During the ceremony, Oscar was given his Order of the Seraphim sash by his grandfather, King Carl XVI Gustaf. However, he will not wear this again until he comes of age. 

Oscar Carl Olof was born on March 2, 2016, at Karolinska University Hospital in Solna, Sweden. He has one older sister, Princess Estelle, who was born on February 23, 2012. 

After the ceremony, the happy family posed for photographers outside the chapel. Princess Estelle, when asked how the ceremony went, responded, "It went really well."