Imagine only having a birthday every four years.
On 29 February, about 5 million people around the world celebrate their once-every-four-years 'real' birthday.
For some of the so-called 'leaplings,' being born on 29 February is an excuse to celebrate over two days when it's not a leap year - but for others, getting into nightclubs is tricky when the bouncers think their security is fake.
The BBC spoke to leaplings all around the world.
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