When a child is 2-4 months old, they start to make "comfort noises". These noises are usually for when the child is in contact with their caregiver therefore in response to them. This includes grunts and sighs being the earliest comfort sounds and 'coos' being later sounds.
When the child reaches around 7 months old, the infant extends their sounds to " canonical babbling" . This is when they extend their sounds by oral articulations and turning them into syllable-like sequences by opening and closing their jaws, lips and tongue.
At 10 months old, infants begin to utter words. They also use words that are not recognized in todays language. This word-like vocalizations may consistently used by infants to express particular emotional states.
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