My health visitor has advised me to stick to one breast until its empty and only then offer the other side rather than do 20 mins on each side. But how do i know when its empty - lo will seemingly just suck an suck forever rather than become annoyed there is nothing in there. Also if he stays on one for a feed, do i start back up with the same one next feed or swap? I'm confused, trying my best to make sure lo is getting hind milk as it was causing problems but now i'm confused! thanks in advance for any replies.