1: 0-6m
2: 6-18m holophrastic: one word speeches
3: 18m-2y making two or three-word utterances
4: 18m-2y
acquire all vowels in the native tongue in 18m-2y,
acquire all consonants in the native tongue in 2-5y,
form questions/interrogatives by 2-5y
Build semantic domains.
Packaging: using one word for a wide range of meanings.
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