We didn't wean from breast to bottle but from Formula to rice milk ,DS was/is a refluxer and cow's milk didn't go well at all and caused us more problems but rice milk was fine . DS was not a keen milk drinker at all so he wasn't on it long after 2yrs old , he now has cow's milk with cereal and he's fine .Are you using bottles at all now with Breast milk ? If not then it might be an idea to introduce a sippy rather than bottle so you cut a weaning process out , they don't half attach to bottles ::)Just thought I would add that soya can be very constipating for some LO's