The table below outlines the typical times that language skills develop:
| Age |
Skill |
| 2 months |
Cooing—producing vowel sounds (“Oooh”) |
| 4 months |
Babbling—consonant-vowel combinations (“Ba ma”) |
| 7 months |
Babbling—with sounds of native language |
| 10 months |
Sound and intonation of native language (“Ba MA ba ba”) |
| 1 year |
First words (“Mama,” “Papa,” “No,” “Shoe”) |
| 2 years |
Vocabulary of 200 words, two-word utterances, telegraphic speech |
| |
(“Want juice,” “Mommy up!”) |
| 3 years |
Sentences |
| 4 years |
Grammatical sentences, often with mistakes (“I holded the bunny”) |
| 6 years |
Vocabulary of 10,000 words |
