One and a half year old baby acute gastroenteritis is generally caused by bacterial and viral infections, but there are a small number of children are due to non-infectious factors, such as due to cow’s milk or dairy allergy, the baby’s digestive system is not yet fully developed, the gastrointestinal mucous membrane is thinner, the stomach acidity is lower, more prone to inflammatory reactions than adults, need to be based on the different circumstances of the symptomatic treatment, and if necessary, as soon as possible, seek medical attention. Common causes and treatments a, non-infectious factors baby may be cow’s milk allergy, with the age of the incidence of a significant decline in symptoms of nausea, vomiting, abdominal pain, diarrhea, etc., the baby will be crying performance, may be accompanied by skin symptoms, such as rashes, red bumps, itching, etc., can be recovered by stopping the consumption of allergic foods, symptoms can be used to alleviate the seriousness of loratadine syrup. Second, the infection factor 1, bacterial infection: baby common Escherichia coli, salmonella, campylobacter and other bacterial infections, different bacterial infections fecal pattern is different, according to the stool routine examination of the preliminary judgment, the diagnosis also need to carry out routine blood and bacterial culture. If there is dysentery-like diarrhea or blood in the stool, you can use cefprozil dispersible tablets, berberine hydrochloride, etc., under the guidance of the doctor, and need to be reviewed regularly until cured; 2, viral infections: rotavirus infections are common in babies, feces are yellow and watery, no pus cells and blood cells, can be initially judged by stool microscopy, confirmed by serum antibody test or stool test pathogen DNA, the vast majority of the can not be applied to antibiotics, but will prolong the course of the disease. The majority of antibiotics can not be applied, but will prolong the course of the disease, the need for rehydration and medication can be symptomatic treatment. Mild diarrhea can be taken orally montelukast adsorption antidiarrheal, vomiting, diarrhea, frequent need to drink warm water or rehydration salts, to prevent dehydration and electrolyte imbalance, in severe cases can be under the guidance of the doctor glucose saline drip. Precautions 1, the treatment of the initial period need to fasting, keep fasting, promote gastrointestinal repair; 2, one and a half years old baby has added complementary foods, the recovery period diet should be soft, easy to digest, such as rice paste, millet porridge, etc., less salt can be, do not add other seasonings, to avoid stimulation of the gastrointestinal tract. Daily diet should be light, avoid greasy and indigestible food, such as fat meat, nuts, excessive dairy products.