An examination of 9720 Zagreb school children, 6-13 years of age, revealed submucous cleft palate (SMCP) in 5 and cleft uvula in 232. The prevalence of SMCP among Zagreb school children was 0.05% or 1:1944. Two out of 102 relatives of CP patients examined had submucous cleft palate. The findings of five SMCP in children and two in parents of CP patients, undiagnosed before the screening, confirms the difficulties of recognition that complicate the obtaining of correct data about their incidence.