Monarchy New Zealand eagerly awaits the arrival of the royal baby and begins preparing a number of landmarks and buildings to light up on cue when it's time to celebrate.

The New Zealand landmarks will glow pink or blue to mark the birth of Duke and Duchess of Cambridge firstborn due out within the month of July.

A list of landmarks and relevant buildings has been set aside but Chair Sean Palmer says he will remain silent for the time being but reveals a number of places in the country have already expressed their interest in participating in the royal welcome.

Meanwhile, Prince William has already prepared for the baby's arrival by having a chopper on stand-by and ready to take him to Catherine's side and witness the birth of their first child. The 175 mph Sikorsky chopper will be ready for take-off to get the Prince to London from the Royal Airforcebase in Anglesey where he is currently staying.

Prince William made a promise to his wife that he will be there when the baby's due at the Lindon wing of St. Mary's Hospital in Paddington, West London. Princess Diana, Prince William's late mother, also gave birth to him in the same hospital in June 1982.

The late Princess of Wales gave a false date and claimed Prince William was due on July 1 when it fact he arrived on June 21, 1982. It was believed to be an effort to give the royal family some privacy.

Last May, the Buckingham Palace announced that that Prince William's firstborn would be born sometime in the middle of July but Katherine later on revealed the official due date will be on July 13. The information was allegedly leaked at a family barbecue.

However, recent developments have raised suspicions regarding Catherine's impending delivery. The rumoured arrival of the royal baby could be anytime this week.

Marcus Setchell, former gynaecologist of the Queen of England, was said to have told guests at a charity cricket match that he will not be drinking any alcohol to prepare for the royal birth. He is expected to deliver the baby before his retirement from the profession.