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Prenatal development - 2 years of age
The child begins reacting to sounds, babbling, gesturing, producing speech sounds, producing words, and eventually starts speaking in 2-3 word phrases -
Age 2 to 5
The child begins by grouping, describing, and defining words, and by the end of 5 years of age, is able to understand more than 2,000 words -
Age 6-12
The child is able to understand a variety of concepts and is able to read and write stories
