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Speech Sound Development

The development of speech sounds varies from child to child, and across a child’s age from birth to six. This is a general guideline about how easy it should be to understand a child’s speech at different ages:

  • By 18 months a child's speech is normally 25% intelligible
  • By 24 months a child's speech is normally 50 -75% intelligible
  • By 36 months a child's speech is normally 75-100% intelligible

**(Taken from Lynch, Brookshire & Fox (1980), p. 102, cited in Bowen (1998))

Please see the following chart to find out how your child’s speech sound development compares to the range of typical development. If you have any concerns, please contact an SLP or make a referral.


 
Source: Sander, Eric K. “WhenAre Speech Sounds Learned?” JSHD, 37 (February 1972)