Regarding the duration of the monitoring period, we suggest that: (1) neonates with an apparent or confirmed life-threatening episode should be monitored until they are free of events for at least 3 months and are at least 6 months of age; (2) siblings of infants who died of sudden infant death syndrome should be monitored for at least 6 months and until 1 month after the age at which the sibling died; (3) infants with apnea of prematurity should be monitored until their conceptional age is at least 52 weeks and they have not had apnea for at least 1 month after all respiratory stimulants and gastroesophageal reflux medications have been stopped.