I've been feeding my 3 week old by offering one breast per feeding, and then switching to the other side at the next feeding approximately 2-3 hours later. (If he does seem to want to nurse more within that time period, I just give him the same breast). I have learned that this is called block feeding. The reason I am doing it is because of an oversupply.
I'm not sure how to work this at night though. He eats about every 3-4 hours at night, so if I am alternating breasts at each feeding, one boob gets "neglected" and potentially goes 6-8 hours without getting nursed on. He gets up twice per night to eat so each boob is getting a long stretch in the night where I get engorged. In the morning I have the lumpy bowling ball boob syndrome.
My concerns are mainly plugged ducts and risk for developing mastitis. I don't really worry about my supply going down (should I?) because at this point that would be helpful. I was pumping 2oz off the opposite breast that didn't get nursed on at each night feeding, just to relieve the engorgement, but I'd really like to get away from pumping anything extra because I want my body to stop making more. Plus, it's a PITA to have to pump and wash all the pump parts, etc, twice in the middle of the night. I already have a gassy burpy baby that needs a lot of soothing after he eats (due probably to overfilling his stomach with milk and my overactive letdown) , the pump is just one more thing in the middle of the night I don't want to deal with.
So - is my "boob neglect" at night going to cause me bigger problems or do I need to continue to pump the opposite breast? I can deal with the discomfort.... especially if it brings my supply down some and makes things easier and more comfortable for my baby to eat.