Breast milk is a so much important for the newborn baby. Best Breast Milk Storage Bags contains water, fat, carbohydrates, vitamins, protein, and minerals, amino acids, enzymes, and white cells. Over the direction of a feeding, breast milk varies from foremilk, high in water and lactose, to hindmilk, excellent in fat and calories. Feeding your baby breast milk is prescribed because of the nutritional gains it provides.