Cooing: The soft, vowel-like sounds that infants make in the first few months of life, often in response to interaction with caregivers.
Canonical Babbling: The stage of babbling where infants produce consonant-vowel syllables, such as 'ba-ba-ba' or 'da-da-da', indicating the development of speech-like vocalizations.
Jargon: The later stage of babbling where infants produce longer, more complex vocalizations that resemble the rhythm and intonation of adult speech, though without recognizable words.