When a child has diarrhea accompanied by vomiting, we first consider the symptoms of acute gastroenteritis. In this situation, we need to analyze the cause. The most common cause is often rotavirus infection. Rotavirus is a self-limiting disease, and treatment is primarily symptomatic, focusing on fluid replenishment to maintain electrolyte balance. It is also important to pay attention to the baby's mental state, responsiveness, and urination. Additionally, we need to be cautious of vomiting and diarrhea caused by intestinal bacterial infections, such as food poisoning, which can present similar symptoms. If a bacterial infection is suspected, we must promptly administer sensitive antibiotics for the infection treatment, while also focusing on symptomatic treatments such as fluid and electrolyte replenishment.