E.T.
When one of my daughters needed extra calories and extra fat, her nutritionist and pediatrician advised adding in more HEALTHY fat, like avocados, olive oil, coconut milk, nut butters, etc. They specifically told me not to make up the extra calories by using cream or extra whole milk. The added calcium actually hinders the absorbtion of other vitamins, and the fat in milk products is lacking nutrients to go along with it.