According to UN estimates the Earth's seven billionth inhabitant has just been born.
Two hundred years ago there were just one billion people - but population growth has accelerated very quickly.
In fact it has only taken a little more than a decade for us to go from six to seven billion.
Al Jazeera's Emma Hayward gets the perspective from a remarkable 12-year-old in Bosnia who was the planet's six billionth person.
