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This paper discusses language acquisition developed through a two-years-old female toddler given initial AJS, who raised in a particular bilingual family consists of her biological parents and a babysitter, along with occasional help from her grandparents in nurturing. In this case, Psycholinguistics as a hybrid of Psychology and Linguistics aim to identify psychological and non-psychological factors regulating the process. The linguistic evidence focused on a list of one-word utterances such as terms of addressing, nouns, verbs, and adjectives consists of vocals and consonants considered as the most frequently spoken by AJS, thus viewed in phonological manner. To recognize how a toddler builds her cognitive development examined through her utterance serves as the purpose of this research. Qualitative method with the case-study approach used with transcription of observation applied as data collection. As a result, AJS can pronounce vocal sounds better than consonants, and is easier to speak terms of addressing and nouns than verbs and adjectives. Overall, language acquisition on AJS shows that language has biologically innated in human, yet develops in cognitive instrument, with social factors related required to form acceptability of its meaning.