How do I tell if a breast is empty? It occurred to me that my dd may not be getting enough hind milk, if I swap sides too soon. Until now I have let her stay on one side until she pulls herself off, and then offered the other, which she usually refuses. But at bedtime she often falls asleep rather than pulls herself off. I'm trying to get her to fill up in order to last longer between feeds, and, when she falls asleep, I've been detaching her and swapping sides. Should I just rouse her a little and put her back on the same side? If I do that how do I know if she is sucking for the sake of it (on empty!) or whether she is actually getting some useful milk?