"We're very emotional," said Kate. "It's such a special time.
Asked how much hair the new prince has, William replied: "He's got way more than me, thank god!"
The Duke and Duchess of Cambridge emerged from St Mary's Hospital with their new baby son tonight to loud cheers from well wishers.
The Duchess said: "It's very emotional, it's such a special time. I think any parent will know what this feeling feels like."
The Duke and Duchess of Cambridge have left hospital with their baby in a car driven by Prince William himself.
The Duke of Cambridge took questions as he stood outside the hospital holding his new son.
"He's got a big pair of lungs on him, that's for sure," said Prince William.
"We're still working on name."
The Duke and Duchess of Cambridge have appeared outside the Lindo Wing at St Mary's Hospital with their new son.
Kate gave birth to the boy at 4.24pm yesterday.
The couple and the child will now travel home to Kensington Palace after Prince William makes some brief remarks to the gathered media.
It's an event that's sparked celebrations round the world but right here in the East region we've more reason than most to mark the birth of the new royal baby.
There's been particular delight in Cambridge, which has a new Prince.
Those who have met the Duke and Duchess say they'll make excellent parents
It's been revealed the new Royal parents and their new son will be making a family home at Anmer on the Sandringham Estate in Norfolk.Read the full story ›
Prince Charles has entered the Lindo Wing of St Mary's Hospital where his first grandchild was born yesterday.
His wife, Camilla, accompanied him.
"Have you had a long wait?" Charles asked reporters.
In a statement issued on their behalf, the Duke and Duchess of Cambridge have thanked hospital staff that helped care for them during the birth of their son.
We would like to thank the staff at the Lindo Wing and the whole hospital for the tremendous care the three of us have received.
We know it has been a very busy period for the hospital and we would like to thank everyone - staff, patients and visitors - for their understanding during this time.