Lactase deficiency is the main cause of lactose intolerance in children. The intestinal wall is not completely smooth and consists of many villi. The top of villi is the place where lactase is secreted. When the intestinal mucosa is damaged, it will first damage the intestinal mucosa on the surface and affect the secretion of lactase. The lactose in the milk you eat will be lactose intolerant without lactase. Lactose intolerance mostly occurs in children with long-term diarrhea, and lactose intolerance will occur in children with severe intestinal mucosal injury. Lactose intolerance can be solved in two ways:

1, you can eat lactose-free milk powder or low lactose milk powder;

2. Breast-fed children can add lactase, and children who feed formula milk artificially can also add lactase. Now there are more and more kinds of lactase in the market, and the production technology of lactase is getting better and better. You can choose lactase according to your child's needs. When eating lactase, you must pay attention to taking it with milk, so as to ensure that lactase can pass through the stomach smoothly and reach the intestine through an acidic environment to play its role.