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%