Hun, are you sure the DMER will affect your work? I don't know too much about it sorry. But if that's the case, then that's understandable. Weaning can be tricky - you want to do it as slowly as you can. Drop one feed, then another, then another. At 12 months, which she will be when you go back to work, I'd say you don't need to introduce formula, she can go straight onto cows milk.