Leap year mother and daughter celebrate one-in-two-million double birthday as they turn eight and one (that"s 32 and four in real years)

Leap year mother and daughter celebrate one-in-two-million double birthday as they turn eight and one (that's 32 and four in real years)

The numbers were against them, but a New Jersey mother and daughter beat the one-in-two-million odds of both being born on February 29.

They today celebrate their 28th and fourth birthdays – or their eighth and first leap year birthdays – as the four-yearly oddity once again rolls around.

Michelle Birnbaum and daughter Rose fluked sharing the unusual birthday date, crediting their coincidence to luck.

Just once every four years: Michelle Birnbaum and her daughter Rose share a birthday today. Their chances of having the same leap year birthday were just one to 2 million

Just once every four years: Michelle Birnbaum and her daughter Rose share a birthday today. Their chances of having the same leap year birthday were just one to 2 million

Ms Birnbaum, a child-welfare lawyer, told the New York Post that 'the stars lined up at the right time' on Rose's birth date.

Having gone into labour on the 28th, it wasn't until the 29th that Rose was born.

She is now introducing her daughter – one of 11,430 babies born on 29 February 2008, according to the National Center of Health Statistics – to a life of two-day birthday celebrations, she says.

'I always felt it was something very fortunate,' she said, explaining that she has parties on February 28 and March 1 most years.

'Almost everyone remembered my birthday, even strangers,' she said, recalling that, at the end of February, the 'checkout lady at the market was always saying “Happy birthday!”'

Parents and daughter: The New Jersey lawyer and her husband with newborn Rose four years ago today. Michelle turns eight while her daughter turns one - in leap years

Parents and daughter: The New Jersey lawyer and her husband with newborn Rose four years ago today. Michelle turns eight while her daughter turns one – in leap years

That's not all she's introducing Rose to. The Saddle River mother said she hopes her four-year-old will soon learn about the stars and planets.

'She’s really smart, so hopefully in the next two years or her next real birthday, she’ll be [learning the solar system],' she told the Post.

According to Peter Brouwer of the Honor Society of Leap Year Day Babies, there are 200,000 leap year babies in the U.S. and just five million in the world.

James Ennis, a professor at Tufts University, told the Post that the odds of a two generations sharing the leap day birthday are just one to 2.1 million.