The two-month-old son of Crown Prince Haakon Magnus and Crown Princess Mette-Marit had been admitted to the hospital (Rikshospitalet) in Oslo last Tuesday evening.
It was the second time in as many weeks that Norway's youngest royal had been in the hospital. Tummy trouble landed him there the week before.
The baby prince is due to be christened in the chapel of the Royal Palace in Oslo early next month.
