Speech sound development in typically developing 2-7-year-old Dutch-speaking children: A normative cross-sectional...

Area of Science:

• Linguistics
• Speech-language pathology
• Developmental psychology

Background:

• Normative data for typical Dutch speech sound development across a wide age range is lacking.
• Existing studies on Dutch speech development have limitations in sample size or age representation.

Purpose of the Study:

• To describe the speech sound development of typically developing Dutch-speaking children aged 2 to 7 years.
• To establish normative data for phonetic and phonological characteristics in this population.

Main Methods:

• A cross-sectional study of 1503 typically developing Dutch children aged 2;0-6;11 years.
• Speech samples collected using the Computer Articulation Instrument (CAI) picture-naming task.
• Analysis included percentage consonants correct-revised (PCC-R), percentage vowels correct (PVC), inventory development, complexity, and phonological processes.

Main Results:

• Significant increases in PCC-R and PVC were observed with age.
• Consonant and vowel inventories were largely complete by ages 3-4 years.
• Phonological processes decreased with age, with most disappearing by 4;4 years, except for specific cluster reductions.

Conclusions:

• This study provides crucial normative data for Dutch speech sound development.
• The findings will assist speech-language pathologists in differentiating typical development from delays or disorders.
• This research fills a gap in understanding comprehensive phonetic and phonological development in Dutch children.