Total 5 clinical symptoms reported for West syndrome  Very Frequent (3)Frequent (2)

Developmental regression	Loss of developmental skills, as manifested by loss of developmental milestones.   Synonyms:Loss of acquired milestones; Loss of developmental milestones; Loss of milestones; Mental deterioration in childhood; Neurodevelopmental regression; Psychomotor regression; Psychomotor regression beginning in infancy; Psychomotor regression in infants; Psychomotor regression, progressive	Very frequent
Infantile spasms	Infantile spasms represent a subset of 'epileptic spasms'. Infantile Spasms are epileptic spasms starting in the first year of life (infancy).	Very frequent
Myoclonus	Very brief, involuntary random muscular contractions occurring at rest, in response to sensory stimuli, or accompanying voluntary movements.   Synonyms:Myoclonic jerks	Very frequent