Swahili speech development: preliminary normative data from typically developing pre-school children in Tanzania

Area of Science:

• Linguistics
• Speech-Language Pathology
• Developmental Psychology

Background:

• Limited culturally appropriate resources exist for Swahili speech-language therapy.
• Research on typical Swahili phonology acquisition is scarce.

Purpose of the Study:

• To describe the speech development of typically developing, first-language Swahili-speaking children.
• To establish preliminary normative data for Swahili phonological acquisition.

Main Methods:

• Cross-sectional study of 24 children aged 3;0 to 5;11 in Dar es Salaam, Tanzania.
• Collected single-word speech samples using culturally relevant pictures.
• Analyzed phonetic inventory, syllable structure, phonological processes, and percentage consonants/vowels correct (PCC/PVC).

Main Results:

• Gradual progression in speech sound and syllable acquisition observed.
• Vowels and most consonants acquired by age 3;0; fricatives /z, s, h/ by 4;0; /θ, r/ by 5;11.
• Older children demonstrated more accurate sound production and fewer phonological processes.

Conclusions:

• Provides preliminary normative data for Swahili-speaking children's speech development.
• Findings can inform further research and the development of contextually relevant speech assessments.
• Highlights the need for culturally appropriate speech-language pathology materials in East Africa.