Prince William finished the first phase of his air ambulance pilot training early - training was originally slated for 12 weeks - and has started his paternity leave.

The 32-year-old Duke of Cambridge expected to remain at his country residence, Amner Hall, while he completed his training. The distance from the country residence and the London ward where the duchess plans to deliver is two hours.

The 33-year-old duchess is currently residing at Kensington Palace, which is close to St. Mary's Hospital, with Prince George.

"The Duke of Cambridge has completed the first phase of his in-work air ambulance helicopter pilot training with Bond Air Services earlier than anticipated," a Kensington Palace spokesperson told Us Weekly. "This is due to a combination of The Duke performing well in the various modules and having very good flying conditions that allowed flight training and assessment to progress more quickly than had been planned."

According to the spokesperson, Prince William will not have to return to Norfolk until June 1 following a "period of official royal engagements in late May, details of which will be announced in due course."

And more good news for the duchess and her son: Uncle Harry will also be around for the birth of the royal baby... provided he or she is born by April 27 when he returns to Australia.

"Prince Harry will briefly return to the U.K. this weekend following the Gallipoli commemorations in Turkey, to attend the London Marathon as Patron of the London Marathon Charitable Trust," the palace told Us Weekly.

"Prince Harry's attendance at the London Marathon is a long-standing commitment," the Palace said, "but was dependent on the finalisation of his programme with the Australian Defence Force and confirmation of travel arrangements to and from Turkey."