What is the defining feature of the vegetative stage?
Sounds of discomfort or relexive actions
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Give some examples
Crying, coughing, burping, sucking, etc.
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In which approximate age group does the vegetative stage generally occur/appear?
0-4 months
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What are the defining features of the cooing stage?
Comfort sounds, vocal play
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Give some examples
Grunts and sighs become vowel-like 'coos', laughter starts, hard consonants and vowels produced, pitch (squeals and growls) and loudness (yells) practised, etc.
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In which approximate age group does the cooing stage generally occur/appear?
4-7 months
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What are the defining features of the babbling stage?
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