You find it odd that your young nephew is constantly labelling the family dog "doggie" yet doesn't seem to apply this same word to dogs he meets elsewhere. This is an example of a(n)

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This is an example of underextension, where a child applies a word in a narrower way than it is typically used. In this case, the nephew is using "doggie" only for the family dog and not applying it to other dogs, which is a narrower application of the term than how it is generally used.

You Find It Odd That Your Young Nephew Is Constantly