HM The King was born at Haga Palace in Solna at 10:20 on 30 April 1946, and was the first son of Heir Apparent Gustaf Adolf and Princess Sibylla.
To announce the news that an heir to the throne had been born, the cannons were fired at all of the country's salute stations and larger naval ships immediately after the birth.
Prime Minister Per Albin Hansson, Minister for Foreign Affairs Östen Undén, Marshal of the Realm Axel Vennersten and Mistress of the Robes Baroness Louise Rålamb signed a Statement of Witness at Haga Palace following the birth.
At an Extraordinary Council of State that same day, King Gustaf V announced that the newborn heir to the throne had been named Carl Gustaf Folke Hubertus, and had been given the title Duke of Jämtland.
Prince Carl Gustaf was christened by Archbishop Erling Eidem in the Royal Chapel on 7 June that year. In connection with the christening, the Order of the Seraphim was conferred on the young prince by his great-grandfather. His godparents were King Gustaf V, Crown Prince Gustaf (VI) Adolf, Crown Prince Frederik (IX) and Crown Princess Ingrid of Denmark, Crown Prince Olav (V) of Norway, Princess Juliana of the Netherlands, Duke Karl Edvard of Saxe-Coburg and Gotha, and Count Folke Bernadotte af Wisborg and his sister Countess Maria Bernadotte af Wisborg.