Diarrhea in 5 months old babies is mostly caused by improper feeding or food. When your 5 month old baby has diarrhea, the first thing you need to look at is what color the stool is, and whether it’s pasty and loose, green and watery, or just plain rice soupy. And how many times a day, and how the stool tastes. Generally speaking, watery stools with a sour odor indicate poor digestion. If the stool is yellow with milk petals, it is because the food that the mother eats contains more fat, which affects the child’s digestive function, causing indigestion and diarrhea. The mother should try to eat some light, easy-to-digest foods that contain more vitamins, and reduce the number of times and the amount of milk she feeds her child. Appropriate medication to help digestion, such as probiotics or lactase. If your child’s stools are green and watery, it is likely that there is a viral infection, or the navel is cold and other factors. It is best to take the child to the hospital, consult a pediatrician, do stool tests, and microbial culture tests, choose the appropriate medication, rehydration to prevent dehydration. Just 5 months baby diarrhea, most because of improper feeding, indigestion, or viral infection caused. Symptomatic treatment is needed.