The bill, titled the Succession of the Crown Act, received royal assent on April 13, 2013, per the UK's official legislative website. That was a few months before Prince George was born. However, the United Kingdom shares its monarchy with 15 other countries in the Commonwealth, and six of those nations argued that they had to vote and legislate the bill independently. Those six realms were Australia, Barbados, Canada, New Zealand, St. Kitts and Nevis, and St. Vincent and the Grenadines (via Constitution Unit). Had those members of the Commonwealth chosen to veto the bill, a first-born girl would have been in the odd position of being heir to the United Kingdom while her younger brother would have been heir in the countries that favored male primogeniture.
Fortunately, the law did pass in all countries — but not until 2015, nearly two full years after Prince George was born. A provision ensured that it applied retroactively to all children born after October 2011. "The idea that a younger son should become monarch instead of an elder daughter simply because he is a man ... is at odds with the modern countries that we have become," noted David Cameron, who was serving as the prime minister of the United Kingdom at the time (via the BBC).
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