When you talk about sibling issues, everyone takes it personally. What I want to talk about today are sibling sex ratios — having a sibling of the other sex versus growing up in all-boy or all-girl sibling configurations. The evolutionary theory, which has been advanced to explain sex ratio, goes back to Darwin, but was fully formulated in by a British scientist named Ronald Fisher, who made the argument that if individuals vary in the sex ratio among their offspring that is, some are more likely to produce more males or more females , the reproductive advantage in a population will always lie with the rarer sex, and thus the sex ratio will equilibrate toward After all, Fisher argued, half of the genetic material of the next generation must come by way of those who tend to produce males, and half from those who tend to produce females.
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Who you should marry based on your birth order
Birth order traits: Firstborns get intellectual advantage over younger siblings
First-born children have a special place in the family hierarchy. They also may be inclined to assume leadership positions. Eldest children also tend to have higher IQs and be more cautious and dutiful , the New York Times reports, and they often earn higher salaries , according to study from CareerBuilder. Kids who are born in the middle tend to be less well defined in their personalities than their older or younger siblings. Research from the University of Redlands in California found that middle-born kids are more relationship-focused , which bodes well for their careers. Katrin Schumann , co-author of "The Secret Power of Middle Children: How Middleborns Can Harness Their Unexpected and Remarkable Abilities," said in an article for "Psychology Today" that middle children are social beings, skilled negotiators, and good team players who think outside the box and resist conformity. Younger siblings are more likely to participate in high-risk sports than their older siblings, according to researchers from the University of California, Berkeley and Guildford College.
Have you been looking for the one? Well, you could be right on the born thing. Apparently, your birth order can predict your romantic compatibility. So instead of going out on a date to see if you like someone enough to be in a relationship with, just ask outright whether they are the firstborn, middle or later born, last born, or an only child.
Does birth order have any bearing on how your love life plays out? A little, experts say. Below, Blair and other experts on birth order offer a few examples.