Has anyone ever used a fat supplement rather than or in addition to a
concentrated formula as an additive to mother's milk?   I have a
failure-to-thrive baby of a mother whose milk has been tested and
determined to be lower than average in fat content (fore and hind).  My
goal is to simply increase milk volume, which will compensate for lower per
unit kcal density.  My immediate goal is to get this 6-week-old up to a
decent weight.

Mother's milk is normal in protein content, so adding concentrated formula
will increase the protein content and renal solute load to higher than
normal levels.  However, her lactose levels are somewhat low, and of course
formula would provide carbohydrates as well.

Fat supplements available include:  salad oil, Microlipid (50 % safflower
oil, 50% water, lecithin, other emulsifiers), MCT (medium-chain
triglyceride) oil, ...?

Arly Helm, MS, Nutrition and Food Sciences; IBCLC