This study determined the intelligibility (words, sentences and story telling) of 43 children (mean age 4.9 years) with unilateral cleft lip and palate who received a Wardill–Kilner palatoplasty, as judged by their parents and determined the influence of age and gender. A comparison with normative data for intelligibility of 163 Dutch speaking children was made. Each child and the parents completed The Dutch intelligibility test. Measures reported include group mean intelligibility percentages for words, sentences and story telling for children aged 2.5–5.0 and 5.0–7.6 years. A significant correlation between age of the children and intelligibility was measured. No significant gender-related differences were found. An interesting finding is the absence of significant difference in intelligibility percentage between the children with cleft palate and the normative data for story
telling. The reported intelligibility percentages provide important prognostic reference information for surgeons who perform palatoplasty and speech pathologists who assess the speech production of children with cleft palate.