Since fourfive
The more you communicate with the child, the more actively he seeks for communication with you.
Each your conversation with the kid is a stimulation of acoustical attention, acoustical and speech memory, activization of voice reactions.
Since fourfive months the child starts murmuring.
Prepare to that the kid will murmur months to seven.
Farewell, chains of vowels!
Hello, first harbingers of consonants!
The mouth increases in volume, so language can move more actively, and the child can say concordants.
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