For centuries, humans have been curious about the effect that birth order has on personality, possibly because eldest children in ruling families typically inherited the seat of power. A new study published in PNAS finds that firstborn children tend to score higher on objective measures of intelligence and self-reported measures of intelligence. But it finds that there are no birth-order effects on other personality characteristics.
Older by minutes or even seconds, makes no difference… 😉
Pregnancy and birthing are very taxing on women, I’ve read studies that claim a woman’s body does not return to normal for 4-5 years after a pregnancy. I wonder if there is some correlation between the intelligence gap and the age difference of the siblings. Would not surprise me to find that pregnancies that happen before the body has fully recovered means that the woman’s body cannot give as many resources to the subsequent children during those critical developmental stages.
TLDR: Got older siblings? If so, here’s something shiny to play with. …but you missed the squirrel.