Based on: Pettitt C, “Criteria for diagnosis of infant colic in the AECC clinic,” AECC Project List, 1999. Infant colic remains one of the most challenging and emotionally taxing conditions encountered in early pediatric care. Persistent crying in an otherwise healthy infant can create distress for families and uncertainty for clinicians. In 1999, C. Pettitt outlined clinical criteria used at the AECC Clinic to guide the diagnosis of infant colic, helping bring structure and