I had the same problem and I'm still working on it. My DS can now BF but I'm still using a nipple shield (my next Project is weaning him off the shield). What bottle are you using? I started with Dr. Brown (slow flow or Level 1) and he could empty it very fast so I switched to the Playtex Nurser (drop in) and it took him a lot longer to finish the bottle. After a few days w/ the new bottle he started to BF only at night in my bed. During the day he would scream every time he saw my breasts. I read we should have a positive attitude and smile while trying even if the baby is screaming and that is what I did for a few days and he finally started to nurse again but not gain much weight so I had to feed him a lot more frequently than what I was feeding with the bottle and also do compressions while feeding (Breast compressions may help: http://www.kellymom.com/newman/15bre...mpression.html), that seems to keep him sucking longer. He is finally associating the breast with food and starting to look happy when I'm about to start nursing and during it also. My next goal is stop using the shield. I've been trying once a day with no success yet. Good luck!