Prebiotics are organic substances that are not digested or absorbed by the host but can selectively promote the metabolism and proliferation of beneficial bacteria in the body, thus improving the health of the host. Prebiotics in milk powder include oligogalactose, oligofructose, polyfructose, breast milk oligosaccharide, polydextrose and so on. 1. Oligogalactose: Oligogalactose is a functional oligosaccharide, which has a strong proliferative effect on the probiotic flora in the intestinal tract, and has a positive effect on the regulation of gastrointestinal disorders in infants and young children, as well as the prevention of intestinal disorders such as abdominal bloating, diarrhea, constipation, and other intestinal diseases. 2. Oligofructose: Oligofructose belongs to soluble dietary fiber, which can promote gastrointestinal peristalsis, improve intestinal function, laxative, proliferation of intestinal bifidobacteria. 3. Polyfructose: Polyfructose is a water-soluble dietary fiber, which can stimulate intestinal peristalsis, regulate intestinal flora and promote the proliferation of bifidobacteria. 4. Breast milk oligosaccharide: Breast milk oligosaccharide has the function of regulating baby’s immunity, helping brain development and regulating intestinal flora. 5. Polydextrose: Polydextrose can supplement the water-soluble dietary fiber needed by the human body, and to a certain extent, it can inhibit harmful intestinal bacteria and promote the proliferation of beneficial intestinal bacteria. Prebiotics are not a panacea, just one of many nutrients, to treat prebiotics scientifically. Probiotics is not the more the better, moderate consumption can be.