I want to introduce follow on formula in a cup for my 7 month old, but he rejects it. Screams, screams, screams. I've breastfed since birth. Tried warm and cold, various times of day etc etc. I go back to work in 3 months and want to wind up BF slowly by combi feeding from now on. He always rejected a bottle too whenever I've tried it, but in any case I now want to wean straight on to sippy cup to avoid having to wean from bottle to cup later on. He loves his food / most tastes so think it's the cup not the milk. Any ideas? Thanks.