Early stages of production Oller (1980) and Stark (1980)

Phonation

#1 The stage of speech development from 0 to 1 month, where infants produce sounds primarily through vocal cord vibrations.

Goo or Cooing

#2 The stage of speech development from 2 to 4 months, characterized by the production of coos and vowel-like sounds.

Expansion stage; vocal play

#3 The stage of speech development from 4 to 6 months, where infants experiment with sounds, pitch, and volume.

Canonical and reduplicated babbling

#4 The stage from 6 to 8-10 months involving repetitive consonant-vowel combinations, also known as reduplicated babbling.

Jargon Stage

#5 The stage in speech development where infants start to produce speech-like sounds with varied intonation patterns, resembling actual speech.

Vocoids

Nonphonemic speech sound productions that are vowel-like sounds made by infants.

Contoids

Nonphonemic speech sound productions that are consonant-like sounds made by infants.