1. What is indigestion in six-month-old babies? Indigestion in six-month-old babies refers to a disease in which babies around six months old cannot effectively digest and absorb food due to some reasons, causing diarrhea, constipation, vomiting and other symptoms. This condition is relatively common in infants and young children and requires prompt diagnosis and treatment. What are the causes of indigestion in 2.6-month-old babies? 1. Breast milk or formula allergy 2. Food allergy