- Child's pragmatical development
- babies learn social conventions before they can speak e.g. game of 'peek-a-boo' familiarises baby with turn-taking and early form of social interaction
- even at babbling stage child's carer might respond to their babbling as if having a conversation - so some basic interaction between child and carer
- as a child's pragmatic development continues can interact in more sophisticated ways. Will start conversation,use full range of speech functions and show politeness features e.g. "hello/ goodbye"
- non-verbal communication and non-verbal aspects off speech (pitch, volume, intonation and pace) also become increasingly sophisticated as children grow up