At what age is the onset of West Syndrome most likely to occur?

The onset of West Syndrome is most likely to occur around 4 months of age. This disorder is a type of epilepsy that is typically characterized by a triad of symptoms: infantile spasms, a specific pattern on an electroencephalogram (EEG) known as hypsarrhythmia, and developmental regression. The condition usually begins in infancy, specifically within the first year of life, with most cases identified between 3 to 12 months old, and the peak onset often observed around 4 to 6 months. Recognizing the age of onset is critical for early diagnosis and intervention, which can significantly affect the developmental outcomes for the child.

The other ages listed do not align with the typical developmental trajectory of this syndrome, as West Syndrome primarily affects infants and is rarely diagnosed later in childhood. Thus, the option indicating 4 months accurately reflects the most common age for the onset of this condition.