Final answer:
Infantile spasms is a special group of non-idiopathic generalized epilepsies that occur in infants. This type of epilepsy is characterized by brief, sudden, and symmetric muscle contractions, known as spasms. It usually begins in the first year of life, between 3-7 months of age.
Step-by-step explanation:
Infantile spasms is a special group of non-idiopathic generalized epilepsies that occur in infants. This type of epilepsy usually begins in the first year of life, typically between 3-7 months of age. Infantile spasms are characterized by brief, sudden, and symmetric muscle contractions, often resulting in a bending forward motion. They can occur in clusters and have a unique EEG pattern called hypsarrhythmia.