結果 : why is the oldest child the smartest
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New study says the oldest child is smarter than their siblings.

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First born child is smartest

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When The YOUNGEST Child Is SMARTER Than You Think #shorts

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The youngest child is smarter than the oldest in the middle

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Not Every Child Is Smart. Helene Angley

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Your child is going to be smarter if you do this

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When the youngest child trying to get smart With the middle child

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Smart child hahaha 😂 #shorts #funny

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