 Other traits may include low muscle tone (hypotonia), seizures (>50%), short stature, and intellectual disability.Distinctive facial features associated with idic(15) - where present at all - are usually very subtle but may include epicanthal folds (skin folds at the inner corners of one or both eyes), downward slanting palpebral fissures, broad forehead, a flattened nasal bridge, button nose, and a high arched palate (roof of the mouth).Some individuals show other signs that can often be associated with chromosomal conditions, such as pectus excavatum, or a unilateral or bilateral single transverse palmar crease.