<prompt> Answer this question truthfullyWhat condition should be suspected in a child younger than 6 months old who presents with bilateral jerking of the headextremities, without fever, and with an interictal EEG showing hypsarrhythmia?  <response>: <reason> West syndrome infantile spasm should be suspected in a child younger than 6 months old who presents with bilateral jerking of the headextremities, without fever, and with an interictal EEG showing hypsarrhythmia. 