Phonological development Vocabulary development

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studies related vocabulary development show children s language competence depends upon ability hear sounds during infancy. infants perception of speech distinct. between 6 , ten months of age, infants can discriminate sounds used in languages of world. 10 12 months, infants can no longer discriminate between speech sounds not used in language(s) exposed. among six-month-old infants, seen articulations (i.e. mouth movements observe others make while talking) enhance ability discriminate sounds, , may contribute infants ability learn phonemic boundaries. infants phonological register completed between ages of 18 months , 7 years.


children s phonological development proceeds follows:


6–8 weeks: cooing appears


16 weeks: laughter , vocal play appear


6–9 months: reduplicated (canonical) babbling appears


12 months: first words use limited sound repertoire


18 months: phonological processes (deformations of target sounds) become systematic


18 months–7 years: phonological inventory completion


at each stage mentioned above, children play sounds , learn methods them learn words. there relationship between children s prelinguistic phonetic skills , lexical progress @ age two: failure develop required phonetic skills in prelinguistic period results in children s delay in producing words. environmental influences may affect children s phonological development, such hearing loss result of ear infections. deaf infants , children hearing problems due infections delayed in beginning of vocal babbling.








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