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Birth
Infants engage in recipricol communication with their caregivers, responding most to facial recognition and vocal cues. -
5 years old
90% of language form has been acquired. -
3-4 months old
Infants learn a signal-response sequences and predictable patterns through rituals and games. -
8-9 months old
Infants develop intentionality through gestures accompanied by eye contact. -
12 months old
The first meaningful word is expressed and sound patterns are continually being stored. -
18 months old
At 18 months old, a child can produce around 50 single words and starting to combine words on the basis of word-order rules; babbling starts to decrease and new word referant associations are made in as little as three exposures. -
2 years old
At 2 years old, a toddler has built a vocabulary consisting of 150-300 words and can use a greater range of grammatical structure wherein the addition of bound morphemes is at an average length of 1.6-2.2 morphemes per MLU. -
3 years old
The toddler begins to express more adult like sentence structures. -
4 years old
The preschooler begins to change conversation style in order to fit partner and mean length of utterance continues to increase to 3.6-4.6 morphemes. -
6 years old
The child begins to learn visual communication through writing and reading. -
Ages 7-13 years old
In early school age years, conversational language continues to develop and narratives expand and gain all of the mature features of storytelling. -
Ages 13-18 years old
Adolecents discuss more topics that are not discussed at home and communicate with more affect and turn-taking.