This paper reexamines Halliday’s (1975) theory of functional categories of infants’ utterances. Halliday’s functional category relies on the perspective of Self as Agent vs. Others as Patient and Halliday’s glossary did not provide any distinctive features for judging the categories. As an alternative approach, this paper suggests different functional categories -i.e., Directive, Informative, and Expressive- and provides four distinctive features: [±Monologue], [±Animated], [±Beneficiary], and [±Imaginary]. This paper emphasizes three key aspects to consider in analyzing infants’ verbal utterances: the importance of systematic consultant with the context of utterance, the dialogic nature of language function in interpreting infants’ communicative intention, and the comprehensive understanding of the participants and the setting. Finally, the significance of studying infants’ communicative intentions on understanding the relationship between linguistic and cognitive development is discussed.