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At birth infants began to communicate through eye contact.
Babies began to Cooing at the age of 2 months.
At about 6 months babies began babbling, vowel combinations. Between 8-12 months infants use preverbal gestures, to convey information.
By the first year, infants understand word meaning. Between 18-24 months telegraph speech began. -
Children begin to use complex sentences containing more than one clause. Vocabulary increases to 250 words by combining two words .
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During school age years children eventually exceed comprehension of 40,000 words. Children also enlarge their vocabularies by analyzing the structure of complex words.