A young family has made history after welcoming their second leap day baby born four years after their first.
New York couple Lindsay and Dane Demchak were preparing to throw their son Omri, who was born on 29 February 2016, a special "first" birthday party when their plans quickly changed.
At midnight on Saturday 29 February, Ms Demchak went into labour, delivering a daughter, Scout, four days early.
"We're the double Leap Year family!" the proud mum told The New York Post.
With one "leapling" already, Mr Demchak says the pair had joked about having another leap day birth. "What if it happens again?" he said. "And then it did!"
Speaking to Essential Baby, the dad said they're just thankful to have a beautiful baby girl. "It's all been a blur and to be honest I don't think the rare chance of having two leap babies has even set in yet."
Despite having to share his birthday, big brother Omri is thrilled to have a baby sister.
"His day got taken from him. But he's very easy going. He's very excited about the baby," Mr Demchak said. "He's been so sweet and caring towards her. he's so excited and although he hasn't grasped it all, he just keeps giving her forehead kisses."
The couple plan to split their children's birthdays in years ahead with Omri celebrating on 28 February, Scout on 1 March, and a special joint birthday bash during leap years.
Omri and Scout join a select club of around five million leaplings around the world.
According to Robin Pemantle, a University of Pennsylvania professor of mathematics, the odds of such a coincidence are pretty slim. Pemantle told the Philadelphia Inquiry that under a set of assumptions - that the date wasn't planned and the children were born naturally - for a couple with only two children, the probability that two children were born on a Leap Day is about 1 in 2.1 million.