Fibernie - hugs to you. It sounds like you have had alot to deal with over the past year. I can only share my own experience with combo feeding. My lo is 11 weeks. Due to a breast reduction surgery 15 years ago, my supply was doomed from the get go, so I did what I could to increase it (herbs, meds, pumping, frequent feeds), but always had to top up with formula. This has worked quite well for us and knowing that she at least got some bm from me made me feel less guilt, as some is better than none. And if you have managed to bf for 12 weeks, I don't think there is anything wrong at all with supplementing with formula every second feed. Now, I agree with Nicola that you could see your supply diminish, but if you could pump after giving her the bottle, then at least stimulation continues at the same frequency. If this would still stress you out, I would leave it be and give her the breast every second feed as you plan, as a stressed mom doesn't help the lo. Recently my lo has started to reject the breast during the daytime, I think because she is more alert and wide awake and therefore doesn't like having to work for it, knowing that the bottle will follow, but this was just a recent development, so I continue to give her boob at night, which she takes well. Anyway, good luck with whatever you decide on.