Distinctive facial features. Distinctive facial features also identify a child with Prader-Willi syndrome. These include a narrow face, almond-shaped eyes, small-appearing mouth, a thin upper lip with downturned corners of the mouth, and full cheeks. The child's eyes may cross (strabismus). Dysmoprhic Features. Characteristic facial features in PWS (Wattendorf 2005). Other physical features include hypopigmentation, small hands and feet, and thick viscous saliva. People with Prader-Willi Syndrome, exhibiting characteristic facial appearance including narrow temples, an elongated face, thin upper lip, and a prominent nose. Everyone with Prader-Willi syndrome is an individual. There are some distinctive facial features associated with Prader-Willi syndrome that are noticeable in babies soon after birth. These include almond-shaped eyes, narrow bridge of nose, narrowing of .
Prader-Willi syndrome is caused by the loss of function of genes in a particular region of chromosome 15. People normally inherit one copy of this chromosome from each parent. Some genes are turned on (active) only on the copy that is inherited from a person’s father (the paternal copy). Description. Sleep abnormalities can also occur. Additional features of this condition include distinctive facial features such as a narrow forehead, almond-shaped eyes, and a triangular mouth; short stature; and small hands and feet. Some people with Prader-Willi syndrome .