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Birth
Babies have differentiated crying to signify needs. -
7-9 weeks
Babies first vocalizations of vowel-like sounds. -
9-11 months
Baby imitates tongue clicks, babbles, and understands and carries out simple commands. -
12-15 months
Child uses one or two words in a meaningful way. -
18-21 months
Child is able to use six to twenty recognizable words. -
33-36 months
Toddler has more adult-like speech and uses two hundred or more words. -
6 years
Child begins to learn visual mode of communication with writing and reading and has a 2,000 word expressive vocabulary. -
10 years old
Children this age tent to converse with mostly with peers and have a vocabulary of 30,000 words. -
15 years old
Children this age have developed most of the language skills they will develop up to adulthood. -
18 years old
Children this age have a vocabulary of approximately 60,000 and their language development is almost complete.