Cerebral visual impairment, Choreoathetosis, Cleft palate, Clonus, Delayed myelination, Depressed nasal bridge, Developmental regression, Diffuse cerebral atrophy, Diffuse white matter abnormalities, Dyskinesia, Dystonia, EEG abnormality, EEG with burst suppression, EEG with spike-wave complexes, Epileptic encephalopathy, Episodic ataxia, Failure to thrive, Febrile seizure (within the age range of 3 months to 6 years), Feeding difficulties, Flexion contracture, Generalized clonic seizure, Generalized non-motor (absence) seizure, Generalized tonic seizure, Global developmental delay, Growth delay, Hyperactivity, Hyperreflexia, Hypoplasia of the corpus callosum, Hypsarrhythmia, Inability to walk, Infantile muscular hypotonia, Infantile spasms, Intellectual disability, Intellectual disability, profound, Joint hypermobility, Limb hypertonia, Microcephaly, Micropenis, Multifocal epileptiform discharges, Myoclonus, Pachygyria, Poor eye contact, Poor head control, Precocious puberty, Renal dysplasia, Seizure, Self-injurious behavior, Short finger, Sleep disturbance, Sloping forehead, Spasticity, Strabismus, Tremor, Umbilical hernia, Uni- and bilateral multifocal epileptiform discharges, Ureterocele, Ventricular septal defect, obsolete Focal seizures, afebril, obsolete Joint laxity