A 1-year-old baby with diarrhea and fever should be given as much water as possible, because when a baby has diarrhea, a large amount of body fluids will be excreted with the stool, and when a fever is present, the unobtrusive water loss through the skin, also increases significantly, so the filling is prone to dehydration, and if the baby can drink, try to get more water. If the fever is low, physical cooling can be performed, if the temperature reaches 39 ℃ or more, you should take oral antipyretics. Diarrhea can take probiotics orally to regulate the intestinal flora. If the stool is thin, montelukast can also be taken orally if there is montelukast at home. If the baby has poor spirit, low urine output, drowsiness, or even convulsions, it means the condition is more serious and needs to go to the hospital immediately to do the corresponding examination.