Baby Billy calls his favorite blanket a "blankie." When he sees other blankets in the house,however,he does not refer to them as a "blankie" because he uses that name only for his favorite blanket.This is an example of

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Underextension is when a child uses a word too narrowly or restrictively, such as only using "blankie" for their specific blanket and not for other blankets. Overextension would be the opposite, where a child uses a word too broadly to refer to many different things. Referential style and holophrasic speech refer to different aspects of language development and do not fit within the context of this scenario.

Baby Billy Calls His Favorite Blanket a "Blankie