Under normal circumstances, the farts of a three-month-old baby who has not yet added supplementary food should not be too smelly. If your baby’s farts are particularly smelly, you can consider the following two aspects: First, your baby has not completely digested the milk after eating it, that is, there are protein particles in the stomach that have not been completely digested. The accumulation of protein particles in the gastrointestinal tract for a long time, with intestinal peristalsis discharged smells more smelly. If this is the phenomenon, the stool will have milk lumps or foam, you can give your baby the right amount of drugs to help digestion, such as multi-enzyme tablets, probiotics, etc. Second, is the mother. For example, eating breast milk, the mother eats foods that are more stimulating, such as onions, garlic, etc.. If this is the reason, the mother should pay attention to light in the diet.