My daughter is 11 weeks old and is only Bf, but I'm returning to work part time in a couple of weeks and she is refusing any and ALL bottles. I've tried them all.From Breastflow to Playtex nursers. When I try or anyone else trys to give her a bottle all she does is play with it and bite down on the nipple. Please does anyone have any advise for me. Maybe theirs some kind of trick I could do.