Total 42 clinical symptoms reported for Severe myoclonic epilepsy in infancy  Very Frequent (3)Uncommon (1)Occasional (16)Frequent (22)

Developmental regression	Loss of developmental skills, as manifested by loss of developmental milestones.   Synonyms:Loss of developmental milestones; Mental deterioration in childhood; Neurodevelopmental regression; Psychomotor regression; Psychomotor regression beginning in infancy; Psychomotor regression in infants; Psychomotor regression, progressive	Very frequent
Focal-onset seizure	A focal-onset seizure is a type of seizure originating within networks limited to one hemisphere. They may be discretely localized or more widely distributed, and may originate in subcortical structures.   Synonyms:Focal onset seizure; Focal seizure; Focal seizures; Focal-onset seizures; Partial seizure; Partial seizures; Seizure affecting one half of brain	Very frequent
Progressive gait ataxia	A type of gait ataxia displaying progression of clinical severity.   Synonyms:Gait ataxia, progressive	Very frequent