Originally Posted by globetrotter
this is a problematic statistic.
here is the thing - the biggest problems with low birth weight have to do with the types of things that often make a person a bad parent:drugs, poor diet, alchohol, bad health habbits. so while many kids are born with low birth wieght and are just fine - I was an extremly small, premature baby - although I am a few inches shorter than I may have been otherwise, I am fine. my mother smoked while she was pregnant - pretty much any baby born to a drug addict, a person who is having trouble feeding herself, an alcoholic or such will most likely be underweight.
so you have to be careful about cause and affect here.
Sure. However, at least some of Conley's studies specifically compare siblings. If one sibling had a bad mother, so probably did the others. Studies probably don't take into account whether or not there was smoking during each pregnancy, and smoking probably doesn't cluster as strongly with bad parenting as does drug abuse, for example. Also, the family environment might have the same effect on siblings, but treatment outside the home, by teachers, classmates, can influence the life course early on, and that treatment is more appearance-based, suggests other research.
(edit)Here's more evidence, from a few years back.
Interestingly enough, Mazumber also studied the physical attributes between siblings, including height and body mass index, which were often similar between them. But while the economist said that weight had only a limited impact on affecting income levels between siblings, the study found that taller siblings fared better financially than shorter ones.
Based on what this company knows about how parents aesthetically choose favorites among their children, height alone is not proven part of it.