Yogurt is made from milk fermented by lactic acid bacteria, which has a health effect on the body, but for infants and children, drinking yogurt is not only not beneficial but harmful. Because the enzyme system for metabolizing lactic acid in infants is not sound enough, it is not easy to digest after eating lactic acid-containing yogurt, which may cause diarrhea and vomiting symptoms, so it is best for infants not to drink yogurt until they are two years old. After two years old, you can try to give your baby some. 1. The pH value of gastric juice is below 2 when fasting, such as drinking yogurt, lactic acid bacteria are easily killed and the health care effect is weakened; the gastric juice is diluted about 2 hours after meals, and the pH value only rises to 3-5, which is suitable for the growth of lactic acid bacteria at this time. 2. Because some strains of bacteria in yogurt and the acid and high sugar content in yogurt are risky to teeth and may lead to tooth decay in children, remember to rinse your baby’s mouth after drinking yogurt. The active lactic acid bacteria in yogurt will die in large quantities after heating, and not only the unique flavor will disappear, but also the nutritional value will be lost. 4. Yogurt should not be taken with certain drugs. Antibiotics such as chloramphenicol, erythromycin, sulfonamides and astringents for diarrhea, such as hypochlorite, can kill or destroy the lactic acid bacteria in yogurt.