By the age of 3, the average child in a professional (lawyer, doctor, engineer, accountant, economist, etc.) family will have heard 20 million more words than a child in a middle-class family and 35 million more than a child in a low-income family. Children from professional families also hear more unique words and twice as many "encouraging" vs. "discouraging" conversations than children from middle-class or low-income families.
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