My son has had a couple of consecutive, partial feedings (he is preemie: 5 months old, 1 month adjusted). At the hospital, one partial feeding wasn't a cause for alarm and they simply attempt to feed for a certain amount of time, but then stop because he would be burning more calories than he was taking in. I don't remember what that amount of time is.
Is there a guideline or formula for the amount of time you attempt to feed? I know it's between 30-60 minutes but I don't know if it's tied to the calories in the formula (my son gets +4 calories for every 20 calories).