Whether you love or hate the Kardashians, they're a family, and families have hierarchies.
"Everyone's had their experience of where they were placed in the family, and with that comes advantages and disadvantages and challenges," psychologist Michele Blick, who has four children of her own, told TVNZ1's Seven Sharp.
She said some research suggests that firstborns have "a slightly higher IQ than their siblings".
"[They're] often more of a perfectionist, which can be great because you might be a high achiever, do well at school, take on leadership qualities - but you also tend to have a fear of failure," Ms Blick said.
By the time the second child is born, parents "are easing up a bit, so they have more freedom", she explained. However, they "can also feel a bit forgotten".
By the time we get to the youngest child, they have to "really assert themselves" for attention from their parents.
"They're vying for attention, so they can be quite extroverted, quite persistent," she said.
However, gender and the age gap between kids also affects personality – and everyone seems to say they had the toughest gig.
Her advice to parents: "With the first born, ease off on the pressure. With the middle born, make sure they have an opportunity to develop a unique sense of themselves. And with the last born, don't let them get away with murder."
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