title: [The phonetic development of normal-hearing pre-school children].
abstract: OBJECTIVE
  To collect the daily speech materials and to discuss the speech development of normal-hearing pre-school children.
  
  
  METHODS
  Based on the database of daily speech materials of children who are 3 to 5 years old, from separate monosyllabic word to syllable,analysis the frequency of words and compare them with adults.
  
  
  RESULTS
  In the spoken words of children who are 3 to 5 years old, we can find all Mandarin phonemes. With independent sample t test, it was shown that there is no significant difference in the distributing of phonemes between children and adults.
  
  
  CONCLUSIONS
  Children who are 3 years old have developed the phonetic system of the language basically.
authors.affiliation: Beijing Institute of Otolaryngology, Beijing Tongren Hospital of Capital Medical University, Beijing, 100005, China. liusha_ls@sohu.com
authors.forename: Sha
authors.initials: S
authors.lastname: Liu
authors.forename: Demin
authors.initials: D
authors.lastname: Han
authors.forename: Xuan
authors.initials: X
authors.lastname: Wu
authors.forename: Lingyan
authors.initials: L
authors.lastname: Mo
authors.forename: Xueqing
authors.initials: X
authors.lastname: Chen
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.forename: Yilin
authors.initials: Y
authors.lastname: Yang
authors.forename: Ying
authors.initials: Y
authors.lastname: Kong
mesh_terms: D000328:Adult; D001301:Audiometry, Pure-Tone; D002675:Child, Preschool; D006309:Hearing; D006801:Humans; D007804:Language Development