What to do if a one-and-a-half-year-old baby has severe diarrhea (common treatments for baby diarrhea) Diarrhea in babies is a very common phenomenon, but if the baby has severe diarrhea, it needs timely treatment. One-and-a-half-year-old babies are more likely to suffer from diarrhea because their physique and immune system are not fully developed. The following are common treatments for baby diarrhea: 1. Replenish water in time. One of the symptoms of diarrhea is a large amount of diarrhea, which will cause the baby to lose water in the body quickly, leading to dehydration. Therefore, when the baby has diarrhea, it is necessary to replenish the baby with water in time. mother