Delayed speech and language development, Depression, Dyskinesia, Dystonia, EEG with focal epileptiform discharges, EEG with generalized epileptiform discharges, Epileptic spasm, Flat face, Focal-onset seizure, Generalized hypotonia, Generalized-onset seizure, Global developmental delay, Hyperactivity, Hypopigmentation of the skin, Hypoplasia of the corpus callosum, Hypotonia, Hypsarrhythmia, Impulsivity, Inability to walk, Intellectual disability, mild, Intellectual disability, moderate, Intellectual disability, severe, Large basal ganglia, Low-set ears, Microcephaly, Motor delay, Motor stereotypy, Multifocal epileptiform discharges, Narrow mouth, Nasogastric tube feeding, obsolete Joint laxity, Polymicrogyria, Poor speech, Sandal gap, Seizure, Short attention span, Short nose, Sleep abnormality, Spasticity, Thin upper lip vermilion, Unsteady gait