The 3-year-old toddler vomiting in the morning and fever of 37.5 degrees at night, can take physical cooling and other symptomatic treatment, followed by vomiting and fever may be acute gastroenteritis or viral encephalitis and other factors related to the need to clarify the cause of targeted treatment. 1. Symptomatic treatment: 3-year-old children with a fever of 37.5 ℃ can not use antipyretic drugs, give priority to physical cooling, such as using a towel to wipe the palms of the hands, feet and armpits and other parts of the body to help reduce fever. 2. Treatment: morning vomiting fever at night more causes, such as may be acute gastroenteritis related, need to follow the doctor’s instructions to give gastric drugs for treatment, such as famotidine, etc., but also need to pay attention to the diet light, most of the fluids, semi-fluid porridge-based. The 3-year-old toddler vomiting in the morning and a fever of 37.5 degrees at night may also have other causes, such as viral encephalitis, etc., 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 instructions.