I started to introduce pumped bm this weekend.  (now we've done about 4-5 feedings with a bottle)  I've notice that at each breastfeeding following a bottle feeding, my lo is very fussy at the breast.  I'm concerned when I go back to work that my lo will start refusing the breast. anything I can do?
                
                             
        
Re: introduced bottle, now fussy at breast
You could try the Breast Flow bottle by The First Years. They have to both suckle and compress the nipple to get anything out (much more like BF). Also, make sure you use the slowest flow nipple available.
When do you go back to work? If he accepts the bottle readily, I would just not give him any myself. If he has it figured out, don't worry about it. Obviously he can do it, so he'll eat at daycare.
Sucking on a bottle is much less work than BF, so you might get him to the point he doesn't want to nurse at all any more.