Growth and Development: As you surely know, protein is an important part of our bodily functions, but there are different types of protein. Cow milk contains “complete” proteins, which means that they are directly useful to our body, both in the production of energy and in growth and natural development. As children, it is very important to drink milk on a regular basis, as research has largely concluded that growth and development, both physically and mentally, can be boosted by this nutritious and natural drink!