Oller's

Question 1

Stage 1

Answer 1

Phonation stage, 0-1 months.

Reflective vocalizations (crying burping, etc)

Question 2

Stage 2

Answer 2

Coo and Goo, 2-3 months.

Back vowels, back consonants, primitive syllable sequences

Question 3

Stage 3

Answer 3

Exploration and Expansion, 4-6 months.

squeals, growls, vocalizations vary daily. Vowels become more adult-like

Question 4

Stage 4

Answer 4

Canonical Babbling 7-9 months.

Reduplicated Babble. CV sequences become more adult-like (stops, nasals, glides)

Question 5

Stage 5

Answer 5

Variegated Babbling 10-12 months.

Intonation patterns appear. Consonant repertoire increases.