Lactose intolerance in infants is mainly due to the lack of lactase enzyme in the intestinal tract, which can’t break down lactose well, and can lead to long-term chronic diarrhea and malnutrition, which can be replaced with low-lactose milk powder or lactose-free milk powder. 1. Low-lactose milk powder: Lactose-intolerant infants may not experience diarrhea and other symptoms when they consume a small amount of lactose, but only when the intake exceeds a certain amount, so they can take low-lactose milk powder. 2. Lactose-free milk powder: Lactose-free milk powder includes milk protein milk powder, amino acid formula or deeply hydrolyzed formula, which is suitable for infants with protein malabsorption and severe lactose intolerance. Breastfeeding is recommended for infants. If lactose intolerance occurs with formula milk, it is recommended to correct the infant’s diet as soon as possible to reduce the intake of lactose, and seek medical attention if necessary.