* Cat-like infant crying
* Cat-like cry in infants
* Abnormal laryngeal development in infants
* Low birth weight
* Severe mental retardation
* Severe growth retardation
* Small head
* Reduced muscle tone
* Round face
* Low set deformed ears
* Wide-set eyes
* Epicanthic folds
* Respiratory problems
* Feeding problems
* Scoliosis
* Cardiovascular defects
* Language delay
* Self-injury behavior
* Communication difficulties
* Headbanging
* Self-biting
* Low I Q
* Creases on the palm of hand
* Strabismus
* Simian crease
* Slightly short hand bones
* Malocclusion
* Harelip
* Cleft palate
* Failure to thrive
* Shuffling gait