I am bfing my 13 week old ds and have been trying to introduce a formula feed last thing at night. He takes it beautifully for the first 2 days and sleeps through the night. Then after a few days he seems to be in agony when i give him a bottle, and he becomes very fussy at the breast seeming to be in permanent discomfort. He has had very bad colic and has mild hidden reflux and has been seeing a co weekly for 8 weeks!!! I have tried changing formulas - SMA Gold, Aptimel, Nanny, Omneo Comfort - but they all produce the same results. Also tried every anti colic remedy in the book!!! If i stop giving him the formula he is fine again within a day - does anyone know why this is happening and will I ever be able to give him formula.