This article attempts to find out the processes and development of first language Acquisition. The processes are started from the first day children are born. Because of the existence  of  a  device  called Language Acquisition Device (LAD) the children are able to undergo several stages before they eventually arrive  to  a  position  which enables them to master the first language. The stages are reflexive crying and vegetative sounds, cooing and laughter, vocal Play, reduplicated babbling, non-reduplicated babbling  and  expressive jargon. Keywords :first language, LAD, processes, first words, first meaning, fis  phenomenon
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