A reference for colostrum and "mature" milk composition: Nutrition During Lactation, National Academy of Sciences, Wash., D.C., 1991 the basic (and of course average) nutrient comp per 100 ml: Colostrum (1-5 days) kcal 58 lactose (carbohydrate) 5.3 grams protein 2.3 grams fat 2.9 grams Milk (over 30 days) kcal 70 lactose 7.3 grams protein 0.9 grams fat 4.2 grams Sanna James, M.S., R.D.