Probiotics for infants and toddlers are of course beneficial because the establishment of the intestinal micro-ecosystem is not sound during infancy and early childhood. Especially for children before two years old, the amount of intestinal probiotics is small and the strains of bacteria are also small. At this time, eating probiotics is good for infants and toddlers to quickly establish the balance of intestinal micro-ecosystem, which is good for digestion and absorption, and is good for improving the nutrition and diet of infants and toddlers. Because of the immature organ function development of infants and young children, immunity and resistance are relatively poor, easy to disease. Disease states, especially digestive system diseases, tend to make infants and young children’s own intestinal dysfunction more serious, when the effect of taking probiotics is better.