| Question | Answer |
| Vegetative | 0-4 months sounds of discomfort |
| Cooing | 4-7 months comfort sounds and vocal play |
| Babbling | 6-12 months Repeated patterns of consonant and vowel sounds |
| Proto-words | 9-12 months word-like vocalisations used consistently for the same meaning |
| Holophrastic / One-word Stage | 12 - 18 months One-word utterances |
| Two-word Stage | 18 - 24 months Two-word combinations |
| Telegraphic Stage | 24 - 36 months Three or more words combined |
| Post-Telegraphic Stage | 36 months + More grammatically complex combinations |
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