My new daughter (1 wk) often falls asleep as I feed her. I will take her off the breast and burp her or reposition her to get her started. But I never know exactly when she's done. I'm trying to listen to her swallows (which are soft) to get a feel for if she's eating or just sucking but do you have any other tips? Sometimes I think she's done and then 20 minutes later we're back at it again.