One of the best attesting facts about child language
development is the occurrence of various words, which a
three-year-old child utters. The main focus of the study
is concentrated on the affixes attached to the content
words and syntactic roles of the function words. The
subject is also able to produce many grammatical
properties like adults do. Even though, not all of the
subject's derivational words work as an adult's standard.
The data of a three-year-old Indonesian child are
recorded weekly for 1-2 hours for approximately one month.
The data are transcribed and identified into the content
words, the syntactic class of content words, the affixes
the child used, and the function words. The study suggests
that the child masters several affixes such as the suffix
{-e} attached to nouns, prefix {tak-}, and prefix {di-};
and function words such as ini 'this', apa y what'r and
mana x which'. While, others cannot be clearly explained.
In addition, the result reveals that most of the subject's
words are concrete things, which are available in his
surrounding.