Overextensions probably occur because

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Overextensions in children's language development occur because children lack the vocabulary necessary to correctly name items. They might use a word they know, such as "dog," to refer to all four-legged animals because they do not have the words to distinguish between a dog, a cat, and a cow. This is not because they do not notice differences or because their definitions are too narrow, but rather because their vocabulary is still developing.

Overextensions Probably Occur Because