Infantile colic and gastroesophageal reflux in breastfed and formula-fed infants

Colic and gastroesophageal reflux (GER) are common concerns in early infancy with overlapping symptomatology and distinct pathophysiologic mechanisms. Colic is typically defined by paroxysmal, inconsolable crying episodes in otherwise healthy and well-fed infants, usually commencing in the first weeks of life and resolving by ۳-۴ months. The etiopathogenesis is multifactorial, involving visceral hypersensitivity, immature enteric nervous system and GI motility, temperamental factors, and caregiver-infant interactions. GER reflects retrograde passage of gastric contents into the esophagus, a process amplified in infancy by lower esophageal sphincter immaturity, short esophageal length, and frequent transient relaxations. Differentiating physiologic GER from gastroesophageal reflux disease (GERD) is critical; GERD is characterized by troublesome symptoms or complications such as poor weight gain, feeding aversion, respiratory manifestations, esophagitis, or anemia. Feeding modality influences symptom expression but does not reliably distinguish colic from GER/GERD. Breastfed infants may experience fewer regurgitation episodes than formula-fed peers in the early months, though both groups commonly display physiologic reflux that abates with age. Formula feeding has been variably associated with increased fretfulness or regurgitation in some cohorts, potentially related to formula composition, volume tolerance, or feeding technique; however, no universal approach to formula modification is indicated for uncomplicated cases. Clinical assessment should emphasize red flags: poor weight gain, persistent vomiting with bilious material, hematemesis, fever, lethargy, or dysphagia. Diagnostic investigations are reserved for atypical or severe presentations and should be guided by red flags; routine imaging, pH-impedance testing, or endoscopy is not indicated in otherwise healthy infants with typical symptoms. Management is predominantly supportive and family-centered. For colic, parental reassurance, soothing strategies, and consistent caregiving routines. For benign GER, conservative measures such as smaller, more frequent feeds, upright positioning after feeds, and trial of thickened feeds (only for formula-fed infants) may be considered in select cases; routine use of acid suppression is not recommended in healthy, term infants lacking objective evidence of GERD. Close follow-up should monitor growth, development, and evolving symptomatology. In both infantile colic and GER/GERD, it is necessary to emphasize exclusive breastfeeding.