That explains why the third in line to the throne is wearing the same Amaia Kids clothes — a £42 Daniel shirt and £44 Gull Shorts — as in the official portraits.
George is spending his birthday on the Caribbean island of Mustique, along with three-month-old Louis, sister Charlotte, three, and parents William and Kate.
He has come a long way since he was pictured toddling around on his first birthday, holding Charlotte on his second, getting into his stride on his third and flashing his now trademark grin on his fourth.
Yet he won’t get too big for his boots. Wills insisted: “We are very normal.”
Proud royal family unveil official photos of Prince Louis christening showing off the five-strong Cambridge clan for the first time