Pediatric Emergencies Practice Test

SIDS risk is highest during a narrow period in early infancy, most commonly around two to four months of age. This window represents the peak because the combination of immature autonomic regulation and typical sleep patterns makes infants particularly vulnerable during this time. After about four to six months the risk declines, and it becomes rare after one year. So the two- to four-month period best matches the peak incidence. The other age ranges fall outside this peak period.