A 5-month-old girl presents to the ED with her parents who are concerned about brief episodes of "whole body muscle contraction." On physical exam, the child has poor head control and absent palmar grasp. Her electroencephalogram shows hypsarrhythmia. Which of the following is the most likely diagnosis?
-Cerebral palsy
-Infantile spasms
-Kernicterus
-Tay-Sachs disease