Lactose intolerance in infants is due to the body’s inability to secrete lactase normally or low lactase activity, so the milk drunk to the human body cannot be completely decomposed, digested and absorbed for human growth and development. At the same time, the milk that cannot be digested is fermented into small molecules of organic acids by the action of bacteria in the intestinal tract, and some gas is produced, thus causing various problems of lactose intolerance. Due to individual differences, the severity of lactose intolerance manifestation varies: intestinal rumbling and gas are mild lactose intolerance; bloating and loose stools are moderate lactose intolerance; vomiting, diarrhea and intolerable intestinal cramps are severe lactose intolerance. There are three main types of lactase intolerance: congenital lactase deficiency, primary lactase deficiency, and secondary lactase deficiency. In addition, malnutrition and protein deficiency can also lead to loss of lactase activity for a certain period of time. Lactose intolerance can neither be treated nor prevented. However, if your baby is lactose intolerant, you can take the following measures to help alleviate your baby’s discomfort: 1. Lactose intolerant babies do not need special treatment if the number of stools is small and does not affect growth and development. 2, for secondary lactose intolerance caused by diarrhea or medication, if the number of diarrhea, weight gain is slow then dietary adjustment is required. It can be temporarily replaced with lactose-free infant formula and gradually replaced with lactose-containing infant formula after the baby’s intestinal symptoms return to normal. 3. Add lactase drops to the milk (breast milk or formula) fed to the baby to supplement enough lactase to break down and digest lactose, and to help stimulate the baby’s intestinal wall to secrete lactase on its own, which will help correct and improve the baby’s digestive system’s ability to adapt to lactose.