Reflexive, Vegetative Sounds

Both

 * 0 – 6 weeks – Reflexive vocalizations: these vocalizations comprise cry and fussing (discomfort) sounds, and vegetative sounds including some of a primitive variety that are found in very young infants but subsequently disappear (*because of how they breathe? Because they’ve gotten used to the outside world? In simple terms, what are the sounds that disappear and why are they primitive?) (Yeni-Komshian, 1980:74)

Vegetative sounds
In crying and making vegetative sounds, the vocal cords vibrate and the airflow through the vocal apparatus is stopped and started. Thus, even these unpromising sounds include some features that will later be used to produce speech sounds (Hoff, 2013:116)