Royal Baby Makes Biggest Entrance In A Century

William and Kate welcome their new bundle of joy, who weighs in as the heaviest heir  to the throne in over a hundred years. INSIDE EDITION gets input from Dr. Lisa Masterson of TV's The Doctors. 

He's one big baby!

Princess Kate’s boy is the heaviest future king in 100 years—weighing in at eight pounds, six ounces. His dad, Prince William, was seven pounds, 1.5 ounces.

INSIDE EDITION spoke to Dr. Lisa Masterson, co-host of The Doctors and an OB-GYN specialist about what the royal baby's weight could mean about his future development.

Dr. Masterson said, "Eight-and-a-half pounds is on the larger side. I should know, I had an eight-a-half-pounder. As long as the baby is nice and healthy and doesn't have any respiratory problems, it should be absolutely fine."

We asked Dr. Masterson the significance of Kate’s 11 hours of labor.   

"That's awesome for a first time mommy. Sometimes it can be 24-hours, so, especially with an eight-and-a-half pound baby, she did fantastic," said Dr. Masterson. 

The team of doctors delivering the future king was led by 69-year-old royal gynecologist, Dr. Marcus Setchell. He delayed his retirement at William and Kate’s request. So what pressure was he under?

"As far as pressure, that doctor is going to do just as good a job with anyone else because their life is the same. We treat everyone the same," said Dr. Masterson.

Experts say the royal birth is sparking a baby boom they're calling the "Copy Kate Effect" with a 60% increase in the sales of pregnancy tests.

Meanwhile, other births on Monday by famous parents were lost in the pomp surrounding the royal baby.

Oscar winning actress Penelope Cruz, who looked ready to pop when she was photographed over the weekend, gave birth to a daughter in Madrid. Dad is fellow Oscar winner Javier Bardem.

Mitt Romney tweeted a photo of his 22nd grandchild along with the message: “Our Josh and Jean also had a new baby boy yesterday. @anndromney and I feel royally blessed.  #22.”

A blessed day for everyone, royal or not.