One year old baby diarrhea and diarrhea is considered to be due to improper feeding, climatic factors, viral infections, bacterial infections and other factors. 1. Improper feeding: irregular feeding, inappropriate amount of feeding or feeding the baby too early a lot of starch, fatty foods, can lead to baby diarrhea and diarrhea. 2. Climatic factors: If the baby’s abdomen is cold, it can make the intestinal peristalsis faster, resulting in the baby’s diarrhea and diarrhea phenomenon. In addition, the weather is too hot, the secretion of digestive juices to reduce or drink too much milk because of thirst, etc., are prone to trigger digestive disorders, diarrhea and water phenomenon. 3. Viral infections: common viruses include rotavirus, enteric adenovirus, etc. After viruses invade the baby’s intestines, they can replicate in the intestinal epithelial cells, causing cellular lesions, leading to impaired ability of the intestinal mucosa to reabsorb water and electrolytes, resulting in the intestinal lumen to accumulate a large amount of intestinal fluid, which can lead to the phenomenon of diarrhea and water retention. 4. Bacterial infections: such as Shigella, Campylobacter jejuni, etc., will directly attack the small intestine, so that the mucosa of the intestinal wall is congested and edematous, resulting in intestinal lesions due to inflammation, and can not be fully absorbed intestinal fluids, the emergence of diarrhea and diarrhea phenomenon. One year old baby diarrhea water, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.