the relationship between a child’s exposure to language and their eventual linguistic abilities. Specifically, they studied differences in exposure as a function of class, and found that “children in professional families heard more words per hour, resulting in larger cumulative vocabularies.” For specific numbers:

” .. 

In professional families, children heard an average of 2,153 words per hour, while children in working class families heard an average of 1,251 words per hour and children in welfare-recipient families heard an average of 616 words per hour.

*have you ever seen an infant reacting to a new group of voices or language?

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Found originally in this post on Reddit/r/askscience