Charlotte Duncalf, a Year 7 pupil at The Latimer Arts College, was born on February 29, 2004, but normally celebrates her birthday on March 1 each year.
Mum Helen Revett says the occasion makes her feel special.
She said: “A lot of people don’t understand it and I think she likes to explain it to them.
Who's been sentenced from Corby, Ecton, Higham Ferrers and Kettering
Sobbing knifeman Brett Trevor who brandished blade in Kettering street sent to jail
Farmers and firefighters battled flames at huge field fire near Kettering
'A heart of pure gold': tribute to truck driver who died in crash near Northamptonshire border
As firefighters battled a field fire near Kettering, two more were deliberately started
“It makes her feel special because when it comes to a leap year it’s much more of an occasion than a standard birthday.
“At the weekend Charlotte went for a meal with her friends and we made her a special cake.
“I actually went into labour a week late and said at the time I thought she would be born on February 29.”
Also celebrating his real birthday today is Philip Capps of Kettering, who is 64 but has only had 16 ‘proper’ birthdays.