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The assumption that language acquisition is relatively independent of the amount and kind of language input must be assessed in light of information about the speech actually heard by young children. The speech of middle-class mothers to 2-year-old children was found to be simpler and more redundant than their speech to 10-year-old children. The mothers modified their speech less when talking to children whose responses they could not observe, indicating that the children played some role in eliciting the speech modifications. Task difficulty did not contribute to the mothers' production of simplified, redundant speech. Experienced mothers were only slightly better than nonmothers in predicting the speech-style modifications required by young children. These findings indicate that children who are learning language have available a sample of speech which is simpler, more redundant, and less confusing than …