The article presents the observation of a rare hereditary disease: Adams–Oliver syndrome. In a newborn girl in the postnatal period, a lesion of the distal extremities was revealed in the form of syndactyly of the proximal phalanges of 4–5 and 2–3 fingers, hypoplasia of the nail phalanges of 2–5 fingers of the left foot, fusion of the proximal phalanges and the absence of middle and nail phalanges of 2–3 fingers of the right foot, hypoplasia of the terminal phalanx and the absence of the nail plate of the 2nd finger of the left hand. In addition to malformations of the extremities, anomalies in the development of the skin on the scalp in the form of an area of aplasia and outgrowths, represented by sweat gland hyperplasia with a fibroepithelial outgrowth, were noted. Cardiac pathology was manifested by a heart rhythm disturbance of the type of sinus bradyarrhythmia. Adams–Oliver syndrome is a complex disease with phenotypic variability, which causes difficulties in clinical diagnosis.