1. What is indigestion in one-year-old babies? 2. What are the symptoms of indigestion in a one-year-old baby? 3. What is the cause of indigestion in one-year-old babies? 4. How to prevent and treat indigestion in one-year-old babies? 1. What is indigestion in one-year-old babies? Indigestion in one-year-old babies refers to gastrointestinal symptoms caused by the inability to fully absorb food due to immature gastrointestinal function. This condition is common but can usually recover quickly if treated and managed promptly.