The detection method for lactose intolerance in babies includes three looks, two listens and one smell. The three looks refer to the presence or absence of milk flaps in the stool, the presence or absence of egg-like, watery stool separation, and the presence or absence of foam. Two listen, including listening to the presence of bowel sounds, the presence of multiple farts. One smell, smell whether the baby’s mouth has a sour odor. Among these 6 symptoms, if there are 1-2, it is mild lactose intolerance; if there are 3-4, it is moderate lactose intolerance; if there are all 6, it is severe lactose intolerance. Lactose intolerance does not require special treatment as long as the number of pulls is not too many. If you have a lot of diarrhea, you should supplement your baby with homemade sugar saline to prevent dehydration, change to lactose-free formula and gradually transition to breast milk when the diarrhea stops, or you can supplement your baby with lactase to relieve it.