There are accepted ways to increase the caloric content of formula. However, I would prefer to have mom increase pumping (Dr. Mom's full faucet idea) and then supplement via tube or cup, with "top milk" for higher fat content. From Nutrition Focus Vol.8(6) Nov Dec 1993 to make 24 kilocal/ounce milk Liquid concentrate 13 oz with 9 oz water = 22 oz of 24 cal/oz formula Ready to feed formula 32 oz plus 3 1/2 scoops powdered formula =33-34 oz of 24 ca/oz formula. Powdered formula 3 scoops in bottle. fill bottle with water to 5 oz level after adding formula powder. = 5oz of 24 cal/oz formula The article says osmolality and renal solute load (RSL) of formula mixed this way will not be a problem. Concetrating the formula to 27 cal or 30 cal/oz should only be done when intake volume fails to provide adequate nutrition for optimal growth (after a trial of 24 cal/oz) and when there are good reasons that the formula volume cannot be increased. It is in part concern about excessive RSL due to restriction fluid volume that prevents regular use of the "concentrating" method to produce formulas that contain more than 24 cal/oz. 3 parts formula to 2 parts water sort of sounds about the same as the liquid concentrate recipe above. Or consult with a dietician if you are still leary of his recipe! I believe there are premixed 24 cal/oz in hospital nurseries, but I've never looked in drug store. Sincerely, Pat in SNJ