Children with unformed stools that come out loose are mainly seen in diarrhea. The causes of diarrhea can include infectious and non-infectious factors. 1. Infectious factors: including viral infections, bacterial infections, fungal infections, parasitic infections and so on: (1) Viral infections: most of the diarrhea in infants and children in the cold season is caused by viral infections. The most common one is rotavirus, followed by norovirus and so on. (2) Bacterial infections: common bacterial infections mainly include Escherichia coli, salmonella, and so on. (3) Fungal infections: Fungi that cause diarrhea include Candida, Aspergillus, etc. Candida albicans is common in infants. (4) Parasites: common amoeba, etc. 2. Non-infectious factors: including dietary factors, climatic factors. (1) Dietary factors: such as improper dietary intake, changing food varieties, and consuming intestinal irritating foods. Such as allergies to milk, soy and other foods that cause diarrhea. Diarrhea is caused by poor digestion and absorption of sugar in the intestine. (2) Climatic factors: due to the sudden change of climate, the abdomen is cold so that intestinal peristalsis increases. Or the weather is too hot to cause a decrease in the secretion of digestive juices, or thirst, drink too much milk, etc., may induce digestive disorders and cause diarrhea. Children’s stool is not shaped, pull out is loose, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.