Features

Feeding problems (75%) (poor suck, poor weight gain)

Delay in sitting and walking

Absent speech

Poor attention span and hyperactivity

Severe learning disabilities

Epilepsy (80%) and an abnormal EEG

Unusual movements (fine tremors, hand flapping, jerking movements)

Affectionate nature and frequent laughter

Wide-based stiff-legged gait

Below average head size, often with flattening at the back

Subtle, but characteristic facial features (wide, smiling mouth, prominent chin, thin upper lip, deep set eyes, tendency to hold tongue between the lips)

Fair hair and blue eyes (60%)

Poor sleeping pattern

Squint (40%)

Scoliosis (curvature of the spine) in 10%