First hand experience taught me that first born children are indeed advantaged, here is an explanation. Birth order doesn’t affect your personality—just your intelligence | Ars Technica
I'm not yet convinced intelligence is correlated to birth order, (at least with my siblings). This part, about parents limited resources, is interesting. Maybe the child that complains about a sibling being loved more has a point.
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.
I'm not yet convinced intelligence is correlated to birth order, (at least with my siblings). This part, about parents limited resources, is interesting. Maybe the child that complains about a sibling being loved more has a point.
The predominant social and psychological theory is that parents have more emotional and intellectual resources to give the first child (at least until a second child arrives); this boosts the intelligence of the firstborn.