What should I do if my baby has diarrhea every time they breastfeed?

Many newborns experience diarrhea after breastfeeding, and many parents are unaware of the cause. Why do babies develop diarrhea immediately after feeding?

What should be done if a baby has diarrhea right after feeding?

Physiological response: Newborns who are exclusively or predominantly breastfed tend to have significantly more bowel movements than those fed with formula. Breast milk contains abundant oligosaccharides, which are more easily absorbed and utilized by the newborn's gastrointestinal tract, resulting in faster digestion and more frequent feeding. Additionally, excess water that is not fully absorbed is expelled through the intestines in the form of loose stools, leading to frequent and watery bowel movements. In such cases, no special treatment is usually required—just ensure proper warmth and hygiene for the baby's abdomen.

Lactose intolerance: Newborns with lactose intolerance lack sufficient lactase enzyme, making it difficult to properly break down and absorb lactose, leading to symptoms such as diarrhea and watery stools. For these infants, foods containing lactose should be discontinued and replaced with hydrolyzed (lactose-free) formula to relieve discomfort.

Gastrointestinal inflammation: Conditions such as acute gastroenteritis or amoebic dysentery. Newborns have relatively weak immune systems and are susceptible to harmful microorganisms, which may lead to inflammatory diseases of the digestive tract. Diagnostic tests such as stool culture and complete blood count can help identify the causative pathogen. Once identified, targeted antibiotic or antiviral therapy should be administered for infection control. Additionally, supportive treatments including antidiarrheal medications and agents to restore fluid and electrolyte balance—such as smectite powder and oral rehydration salts—should be provided. We hope this information helps. Wishing you good health and happiness.