There is research that counters the idea that first borns are more intelligent than sibs and this study does NOT show that first borns are more intelligent. In fact, it show quite a different picture and is an excellent pience of researhc. Why have such a misleading title to the article? Is Kathy Jones a firstborn? It may be a conspiracy of firstborns! Beware of claims that use the concept of "intelligence!" it's a very misused concept that can easily turn into an undeserved put down.