Proteins are the most important for the growth of children up to the age of 14. Proteins are essential for the development and repair of tissues, including muscles, organs, and bones. They are made up of amino acids, which are the building blocks of the body. Protein also plays a crucial role in the development of a child`s immune system and helps them fight off infections and diseases.

While vitamins and fats are also important for overall health, they do not have the same direct impact on growth as proteins. Vitamins support various bodily functions and help maintain a healthy immune system, while fats provide energy and support the absorption of certain vitamins. While milk is a good source of protein, it is not the only source, and there are other protein-rich foods that can contribute to a child`s growth.