The Birth of a Royal Child
Throughout history, the birth of a Royal Child has been accompanied by traditions and official celebration. Today, the birth of a Royal Child is celebrated by gun salutes, and public authorities will fly the Danish flag, etc.
Salutes
After Her Royal Highness The Crown Princess has given birth to a child, salutes will be fired from the Battery Sixtus on Holmen in Copenhagen and from Kronborg Castle at Helsingør. The four cannons used at the Battery Sixtus date back to 1944. They are operated by Navy personnel. The 17 cannons used at Kronborg Castle date back to 1766-1769. They are operated gunners from the Army. In both places, black powder will be used.
Both Battery Sixtus and Kronborg Castle will fire 21-gun salutes. If the Crown Princess gives birth before 12 noon, salutes will be fired the same day at 12 noon. If the Crown Princess gives birth after 12 noon, the 21 shots will be fired the following day at 12 noon.
Cannon salutes have been used as a signal to announce great events throughout history. At the time of the Vikings, special signals in the form of beacons were used to announce important events
Flying the Danish flag
Official Denmark celebrates the birthdays of specific members of the Royal Family by flying the Danish flag. This is also the case in connection with the birth of a Royal Child. If the Crown Princess gives birth before 12 noon, flags will fly the same day from 12 noon. If the Crown Princess gives birth after 12 noon, flags will fly from official buildings as well as ferries, etc. the following day.
The Royal Danish Life Guards
In connection with special days in the Royal Family, it is a tradition that the section of the Royal Danish Life Guards on duty at Royal Castles and Palaces will wear what is known as ”blå vagtgalla” (blue gala duty uniform). They will do so from the hour when the birth of the child has been announced and until midnight. If the child is born after midnight, the guardsmen will wear blue gala duty uniform from the following morning at 6 a.m. until 12.p.m.
The blue gala duty uniform differs from the ordinary guard outfit, which is called “blå vagtmæssig” (blue uniform for daily guard duty), in that the blue gala duty uniform includes a hat sling. This is fastened to the bearskin and goes round the neck. Private guardsmen and non-commissioned officers’ hat sling is a white cotton cord, whereas officers wear a golden hat sling. The original function of the hat sling was to ensure that the soldier did not lose his headdress in battle.
I had guessed a girl....but its good that there is a boy in the mix! Maybe Princess Alexia of the Netherlands & he will get married in about 20+ yrs! 
