Compare and contrast the nutritional needs of infants and adults

As the main consideration, the difference in nutrient needs between adults and infants exist because infants still haven't reach their maximum bone and muscle development. If being compared, the difference between the two would look like this:

Adults : - need about 100 calories of nutrient per kilogram

             - Needs calcium and vitamin D to maintain bone structure

             - Needs a lot more fiber than infant

Infants : - Need about  116 calories of nutrient per kilogram

              - Needs calcium and vitamin D for Growth

              - Need less fiber