Emma went into labour on Monday, the same time that the Duchess was admitted to hospital in London.
Oliver was born at 11:54am, weighing 7lb 1oz. The royal baby was born at 4.24pm and weighed 8lb 6oz.
Liam, of Whitnash, Warks, joked that the royals copied their wedding plans and it looks like even their first-born was coordinated.
When the new heir to the British throne was born, three other babies were likely born somewhere in the world in the very same second, statistics show; 254 others within a minute; 360,000 others before the Earth had completed a single turn on its axis. Few, if any, of course, are destined to become a monarch.