YIKES! I breastfed all three of my children and had to go back to work with the first two so I made a concerted effort to do as the experts say and introduce the bottle at 3 to 4 weeks CONSISTENTLY is the key word, giving a bottle several times a week so I could pump at work and have my kids get expressed milk. With the first two, they were used to the bottle by the time I returned to work when they were 3 months. With my third, he was resistant from the beginning and knowing I wasn't going back to work this time, I was not as consistent and then wham, in the eighth or nineth week, he outright rejected the bottle, screaming his head off. I sought advice from lactation consultants who told me that it would be a MAJOR struggle, but I may be able to get him to do it if I started introducing the bottle several times a day, continually offering. But in my case, I was told, why bother since I wasn't going back to work and didn't need to pump. For you, goodness, 14 weeks is SO late that it could be totally traumatizing for your poor baby to now get used to a bottle if she hasn't had it much up to this point. Is she taking it at all or does she just scream her head off? If she is taking from it, you may have a good chance. Just keep trying- have someone else preferably feed her the bottle, NOT YOU(best if you're not in the room) and do it at least once a day. But if she's screaming, and crying hysterically at the bottle and won't attempt to suck as my son did, I couldn't bear it and just stopped. In that case, could you work your schedule around her feedings? In a few months, she'll go for longer between feedings, 3-4 hours, then longer as she gets older. I have a friend this happened to and she had to go back to work full time and she told me how the day care fed the expressed milk any way they could, through a dropper, spoon, cup, whatever way they could get it into her baby's mouth since the baby refused the bottle. As another person said, it's good to continue to offer but a 14 week old baby may have her mind made up as my baby did and you may have to find another alternative to feed her. Good luck!