Why do more researchers think that birth-order influences on child development have been emphasized too strongly?

Question

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When all the factors that influence behavior are considered, birth order by itself shows limited ability to predict behavior. This suggests that the influences of birth order on child development have been overstated. Additionally, there is no clear consensus on the patterns of birth-order influences on personality, and some argue that the descriptions of such patterns are largely speculative and not based on concrete evidence. Furthermore, continued emphasis on birth-order influences could potentially create self-fulfilling prophecies that perpetuate birth order, making it difficult to isolate its true effects on child development.

Why Do More Researchers Think That Birth-Order Influences on Child