Speech and Language Development Class - Building Blocks of Language
Look, it's the kitty!
Are the kitties unhappy?
Kitty, you're so big now!
Are you hungry, kitty?
I'll feed the cat, then I'll go to bed.
At this stage, the infant is becoming aware of phonemes in her native language through perception. Here, she demonstrates an awareness of prosodic cues - she demonstrates a sensitivity to syllable stress when she repeats the stressed syllable of "kitty", a word that she parsed from the adult's speech stream. This 6 month old will soon begin to become specifically attuned to the sounds of her native language.
At this stage, the child demonstrates the use of an inflectional morpheme, '-s', marking plurality. This helps the child expand their vocabulary from a smaller set of root words. The child also uses the derivational morpheme "un-", which changes the meaning of the base word "happy". Proper phonological development, the previous stage, sets the groundwork for acquiring words that can be expanded with derivational or inflectional morphology.
At this stage, you can see an increase in utterance length, and the use of different sentence modalities. She even uses complex syntax in the form of phrasal coordination. This stage builds on the previous stage, morphological development, by taking the inflectionally/derivationally expanded vocabulary, and sophisticatedly organizing it according to structural sentence rules.