Six-month-old Emir is sitting in his car seat and repeatedly saying "na na na na na." Emir is best described as

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Emir's repeated vocalization of "na na na" indicates babbling, which is the repetition of simple syllables, consonants, and vowels. Babbling is a common developmental stage for infants around six months of age. Pragmatics refers to the social use of language, cooing is a specific type of vocalization that infants make around two months of age, and holophrasing refers to the use of a single word to convey a complete thought, which typically develops around one year of age.

Six-Month-Old Emir Is Sitting in His Car Seat and Repeatedly