A child's gastrointestinal tract isn't simply a miniature version of an adult's—it's an evolving system with specific physiological characteristics that change rapidly over time. Digestive problems in children are among the most frequent reasons for pediatric consultations, often linked to normal developmental phases that worry parents but resolve on their own or with simple adjustments.

Infant Colic (0-4 months): Inconsolable Crying

Infantile colic affects 10-40% of newborns in their first weeks of life. By definition, it's inconsolable crying for more than 3 hours a day, more than 3 days a week, for more than 3 weeks in an otherwise healthy and well-fed baby. The causes remain partially unknown. The most credible theories: immaturity of the enteric nervous system (the intestinal "second brain"), intestinal gas from microbiota immaturity, hypersensitivity to milk casein (in formula-fed infants), and transient lactose intolerance. The good news: colic almost always disappears by the fourth month.

What can help with colic: in breastfed babies, some mothers report improvement by eliminating dairy, cruciferous vegetables (cabbage, broccoli), or caffeine from their diet. While not systematically documented, it's worth trying. Probiotics (Lactobacillus reuteri DSM 17938) have shown a reduction in crying time from colic in several clinical studies on breastfed newborns (less effective in formula-fed infants).

Physiological Reflux (0-12 months): Normal but Worrying for Parents

40-65% of infants regurgitate at least once a day by 4 months. Physiological reflux differs from pathological vomiting: it's effortless regurgitation after meals, painless, without weight loss, and without apneic episodes. It's caused by immaturity of the lower esophageal sphincter (LES), which is functionally insufficient in infants. It resolves spontaneously in 80% of cases by 18 months. It requires no treatment: smaller, more frequent meals, semi-upright positioning after feeding, and careful burping.

Constipation in Young Children (1-5 years): Causes and Solutions

Functional constipation is very common during the transition to solids and toilet training. Frequent causes: transition to whole cow's milk (reduces intestinal motility compared to breast milk), a fiber-poor diet, low water intake, and withholding stool (especially during training). The vicious cycle of constipation: hard stools cause pain during bowel movements, the child holds back to avoid pain, and the stools become even harder. Breaking this cycle is the priority.

Dietary solutions: increase fiber (fruit, vegetables, whole grains), increase water (many children drink very little), prunes in any form (osmotic effect of sorbitol), pears and kiwis (soluble fiber). If diet isn't enough: talk to your pediatrician about osmotic laxatives (macrogol) that are safe for children and break the pain-retention cycle.

Functional Stomach Pain in School-Age Children

Between ages 5 and 12, recurrent stomach pain with no identifiable organic cause (periumbilical pain, weekly episodes, without fever or weight loss) is very common. The main cause is the gut-brain axis: stress, school anxiety, and family conflicts express themselves through intestinal symptoms in children who don't yet have the tools to process them verbally. It's not "pretend": the pain is real, but its cause is psychosomatic. The most effective treatment is a combination of reassurance, abdominal relaxation techniques, and if necessary, psychological support.

Celiac Disease in Children: When to Suspect It

Celiac disease often manifests in childhood. Signs that should raise suspicion of celiac disease in a child: stunted growth or weight loss, chronic diarrhea or voluminous, foul-smelling stools, persistent abdominal bloating, iron-deficiency anemia unresponsive to supplementation, and delayed puberty. Diagnosis requires serology (anti-tTG IgA) and intestinal biopsy while the child is regularly consuming gluten. Don't eliminate gluten before completing the diagnostic workup.

The Symptom Diary for Children with Digestive Problems

If your child has recurring digestive problems, keep a diary for two weeks: what they ate, when symptoms occurred, what their stools were like (use the Bristol Stool Scale for children too), and any stressful events that day (a test, conflict with a friend, family argument). Often patterns emerge clearly: Monday morning stomach pain has a different origin than bloating after pizza and ice cream. The diary is the most valuable diagnostic tool you can bring to your pediatrician.

The Right Fiber for Constipated Children

For preschool-age children with constipation: kiwi is the most effective and most accepted fruit by children (sweet, colorful, eaten with a spoon). Two kiwis a day have shown clinical effectiveness for constipation in children. Dried prunes softened in hot water and blended hide easily in yogurt or porridge. Whole pears with skin, oatmeal in morning porridge, well-cooked and blended legumes in soups: small additions that increase fiber without forcing.

When to Take Your Child to the Pediatrician for Digestive Problems

Signs requiring urgent medical evaluation: blood in stools or vomit, fever associated with intense abdominal pain, involuntary weight loss, pain that wakes the child at night, progressive abdominal bloating, and bilious (green) vomit. Signs requiring non-urgent but important evaluation: constipation that doesn't respond to dietary interventions after two weeks, recurrent stomach pain for more than three months, stunted growth.