What is speech intelligibility?
Speech intelligibility is how much information familiar and unfamiliar listeners can understand when a child is speaking.
What is typical for speech intelligibility development?
Children UNDER the age of 18 months:
familiar and unfamiliar listeners can understand less than 25% of their speech.
Age 2:
Familiar listeners (moms, dads, siblings, grandparents, caregivers, etc) can understand approximately 50-75% of speech and unfamiliar listeners can understand approximately 50%.
Age 3:
Familiar listeners can understand approximately 75-100% of information and unfamiliar listeners should be able to understand approximately 75% of speech
Age 4: 
Familiar listeners and unfamiliar listeners should be able to understand 100% of information being relayed by age 4. *This also includes typical and atypical speech sound errors

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