Professional treatment methods for diarrhea in one-year-old babies are recommended. Babies under one year old have weak immunity and may easily cause diarrhea due to irregular diet or other infectious factors. When your baby has symptoms of diarrhea, in addition to promptly treating the diarrhea, you also need to seek medical attention promptly to avoid aggravation of the condition. The following introduces the treatment methods for diarrhea in one-year-old babies. Deal with diarrhea promptly. One-year-old babies need to clean up their diarrhea promptly and replace it with clean diapers.