A 3-year-old toddler with a fever of 37.5 degrees in the morning and vomiting in the evening, without urination for several hours, may be related to acute gastroenteritis, cold and other factors, according to the specific cause of the physical cooling treatment, medication and so on. Acute gastroenteritis: A low-grade fever accompanied by vomiting and not urinating may be related to acute gastroenteritis, which can be treated with physical hypothermia and drinking more water. In addition, we need to find the specific cause of gastroenteritis, such as bacterial infection, you need to use cephalosporin, amoxicillin and other antibiotic treatment. Cold: young children if cold caused by gastrointestinal cold, may also appear in the above situation this symptom, generally can let the baby drink more water, promote the body’s metabolism, pay attention to warmth and other ways to relieve, if necessary, can take patchouli Zhengqi granules and other relief symptoms. 3-year-old toddler morning vomiting night fever 37.5 degrees, several hours without urine, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment. The medication should be in accordance with the doctor’s prescription.