If a child has a stomach ache and has a fever, the following treatment measures can be applied. First of all, apply montelukast with bifidobacteria to children. Children’s abdominal pain and fever are mainly caused by bacterial enteritis or viral enteritis, montelukast can protect the intestinal mucosa, and bifidobacterium is a probiotic, which can regulate the disorder of intestinal flora in children, and also help to improve the abdominal pain and fever. Secondly, children should be given antibacterial drugs in time. If the abdominal pain and fever are caused by bacterial infection, the child can be treated with ceftriaxone and other drugs to fight infection. Finally, children and treatment need to be given and treated using surgery. If the child’s abdominal pain accompanied by fever is due to acute appendicitis, this time to actively carry out surgical treatment.