If a child has vomiting and diarrhea, it means that the child has eaten inappropriately, has a cold abdomen or has been infected with some bacteria or viruses, resulting in acute gastroenteritis, which should be checked and actively treated at the hospital as soon as possible, because vomiting and diarrhea can cause dehydration, acidosis and electrolyte disorders. When a child eats something inappropriate or gets cold and vomits and poops, it is because the digestive tract function of the child is not well developed and is particularly prone to digestive disorders, when infected with various bacteria or viruses can cause a decrease in lactase activity, then diarrhea will occur. If the child has bacterial infection, it means that the child has infected diarrhea, which requires active infection control and symptomatic treatment, as well as hydration to prevent dehydration. For children, it is particularly easy to have intestinal viral infections in autumn and winter every year, for example, rotavirus infection is common, rotavirus can make children show vomiting and diarrhea, in this case symptomatic treatment is the most important, prevent children from dehydration in the first place in the treatment. Children with underdeveloped digestive tract are particularly prone to vomiting and diarrhea, so they must be treated actively.