siblings

(Newser) - In the wake of the study released last week on intelligence and birth order, parents and social scientists are scrambling to explain why firstborns score an average of three IQ points over subsequent children. Theories range from the role older children play as tutors to younger sibs to the notion...

(Newser) - Big siblings have long suspected it, and now science backs them up: Oldest children have slightly higher IQs than younger kids. Family dynamics, not biological factors, account for the 3-point discrepancy, which holds up for children who become the oldest after the firstborn dies. That tiny gap may mean the...