Lactose intolerance, also known as lactase deficiency, generally does not cause diarrhea due to the inability to digest lactose as long as it does not contain lactose. You can use formula milk, goat's milk is also acceptable, you can use lactose-free formula, or you can use fresh cow's milk or fresh goat's milk, which will help your baby's full nutrition. As long as the baby's nutritional status is ensured, complementary foods can be added if the baby is slightly older, because diarrhea caused by lactose intolerance will heal without treatment, and the prognosis is generally good. Some patients with lactose intolerance can drink goat's milk, while others cannot, depending on the severity of the disease. For those with mild illness, it is still recommended to drink breast milk when conditions permit. However, if the amount of breast milk is not enough, goat milk or other types of formula milk can be appropriately consumed. If necessary, lactase is given to children to promote the body's digestion and absorption of lactose. Severe lactose intolerance causes symptoms such as diarrhea, bloody stools, and dehydration. It is not recommended to drink breast milk, cow's milk, or goat's milk, because it contains lactose, which is not conducive to recovery. At this time, it may be necessary to switch to lactose-free formula, and then gradually give breast milk or formula feeding after intestinal function has fully recovered. Some people will experience diarrhea after drinking goat milk. This phenomenon may be caused by the following factors: First, goat milk deteriorates. Deterioration or contamination of goat milk may cause acute gastroenteritis and diarrhea in patients. Second, the drinking method is improper. Improper drinking methods such as drinking iced goat's milk stored in the refrigerator, drinking goat's milk on an empty stomach, or drinking goat's milk without heating it may cause diarrhea symptoms in patients. Third, lactose intolerance. This is because the patient's lactase activity is reduced, deficient, or even missing, resulting in the inability to absorb lactose entering the intestine, resulting in diarrhea symptoms in the patient. Fourth, goat milk allergy. Some patients with special hypersensitivity will be allergic to goat milk, causing allergic enteritis and diarrhea.