History Evaluation of an event initially involves a thorough history, including Observations by the caregiver who witnessed the event, particularly a description of changes in breathing, color, muscle tone, and eyes; noises made; length of episode; and any preceding signs such as respiratory distress or hypotonia Interventions performed (eg, gentle stimulation, mouth-to-mouth breathing, CPR) Prenatal (maternal) or current caregiver use of medications, tobacco, alcohol, or illicit substances Information about the infant's birth (eg, gestational age, perinatal complications) Feeding habits (whether gagging, coughing, vomiting, or poor weight gain has occurred) Growth and development history (eg, length and weight percentiles, developmental milestones) Prior events, including recent illness or trauma Recent exposure to infectious illness Family history of similar events, early deaths, long QT syndrome or other arrhythmias, or possible causative disorders Features in the history suggestive of child abuse should be sensitively assessed.