The world's seventh billion person was "officially" born today - but according to some experts, the UN might have jumped the gun.
The US Census Bureau says the most likely date the world population will reach seven billion is between March and April next year.
Sergei Scherbov of the Vienna Institute of Demography said there was a 95% probability that the figure will be reached between January and July 2012.
"People have no idea how many of us are here," he told the BBC.
Even the United Nations's own population estimates chief, Gerhard Heilig, admitted it was "nonsense" to suggest anyone could pinpoint where the seven billionth child will be born.