HI
If your baby is having any tummy issues (gas, etc) my lactation consul. said to feed on one side so the baby gets the fatty milk (just like you said--fatty milk helps settle tummies) and do that for a 6 hour stretch and then switch sides for another 6 hours. Pump the other side for relief. (If babies get too much fore milk then they get gassy and have upset tummies, I guess it has to do with too much lactose.) I have been doing this sort of...I feed my baby on one side for 2 feeds and then switch which, turns out to be about 4 hours or so. So if your baby is doing fine with switching sides at one feeding then go with that, just make sure that your first breast is drained (which I think is hard to determine sometimes). My baby was having some tummy issues with gas and possible reflux so I am following the one side feed deal.