Generally speaking, when lactose intolerance is detected in the stool, the following two results of the stool test should be taken into account: firstly, the pH value in the stool. Secondly, the lactase enzyme, after the child suffers from lactose intolerance, the lactase enzyme in the stool is positive, in this case, the child should be given timely application of de-lactose milk powder or add lactase enzyme when giving the child breast milk, in order to effectively alleviate the symptoms of the child’s increased frequency of stools and dilute stools. Therefore, if children have bad stools, they should be given a lactase test in time.