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

Question

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Studies have shown that birth order has limited ability to predict behavior when all the factors that influence behavior are considered, suggesting that birth order influences have been emphasized too strongly. Additionally, there is no clear pattern of birth order influences on personality and some researchers argue that the patterns that have been described are largely speculative and not based on evidence. Finally, continued study on birth order influences may lead to self-fulfilling prophecies that perpetuate the idea that birth order has a strong impact on child development.

Why Do More Researchers Think That Birth Order Influences on Child