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Birth to 3 months
The infant starts vocalizing with cooing, gurgling, sighing and laughing -
3 months
The infant responds vocally to someone who is engaging with them -
6 or 7 months
Child starts to babble, and this babble can start to resemble words, mama -
9 to 12 months
Babbling starts to resemble or mimic adult words or speech -
One Year
First words are spoken, and other words are filled in with hand gestures -
18 to 24 months
The child begins combining words on the basis or words-order rules and starts answering yes or no questions. -
Two Years
The toddler begins adding bounds morphemes, uses "please" and talk about things that are wrong or missing -
Three years
Adult-like sentences begin with a subject and a verb and why questions -
Four years
Able to carry on a conversation which can include past events, reasoning, predicting expressing empathy, and creating imaginary roles, and knowledge of letter names and sounds and recognition or numbers and counting emerge. -
Five to Seven years
Ninety percent of language is formed and child begins to tell narratives that are true stories that shows a central focus with a beginning, middle and an end. -
Six Years
The child begins to learn visual mode of communication with writing and reading -
Seven to Nine years
Language is used to establish and maintain social status, begins to understand jokes and riddles based on sound similarities, starts defining terms and giving background information, and stories are become more developed with characters' goals, motivations, and reactions, and understanding of multiple meanings of words. -
Nine to Twelve years
The child understands common idioms and can acquire information from written texts. -
Twelve to Fourteen year
Child is able to give abstract dictionary definition for words and can explain meaning of proverbs in content -
Fifteen to Eighteen years
The average vocabulary of high school graduate in 10,000 words and written language is more complex than spoken language.