Because milk is the only food of animal babies of breastfeeding. Milk is rich in many nutrients that the body needs the nutrients in milk to create a healthy body at all times.
First of all, Water is a major component of milk More than 85% of milk, so it is a good source of water in the diet. Water is a medium-fat milk protein dispersed. There was an emulsion of oil-in-water emulsion and water as a solvent, the sugar in milk. And water-soluble vitamins and minerals in milk.