The standard formula for babies who aren't breastfed combines cow's milk proteins with vegetable fat, lactose, and all the known vitamins and minerals that are in breastmilk in order for the formula to mimic not only what's in breastmilk but also to come close to providing the growth and development that breastmilk creates. As a result, two fatty acids, DHA and ARA are added to mimic their stimulate development of the brain and eyes (These are discussed in detail in another blog post).