Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

n. The ordinal position by birth of a child in relation to one or more other siblings. Among a number of siblings, it is also the rank of a child as determined by his or her age. It exerts more of an effect on personality rather than on intelligence. Its role in personality development was first proposed by Austrian doctor Alfred Adler (1870-1937).

BIRTH ORDER: "Birth order is often studies in terms of its effect on personality, intelligence, sibling interaction, and parental discipline."

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