AbstractThespeech characteristics of four syndactylyly patients and five Treacher Collins patients are described. Each patient was given a battery of tests including X‐ray analysis, articulation tests, a diadochokinetic rate analysis, to evaluate the speech proficiency and the functioning of the periphreal speech mechanism.Because of the wide range of associated defects, many involving the speech mechanism, often accompanying these two congenital anomalies, this study does indicate that such cases should be seen and studied by the speech pathologis