My DD is 5 and a half months and is only bf. I have a doidy and she can manage it with me guiding her, but it's messy and ebm is a bit precious to be dribbling down her front! I've bought a cow cup that has a valve to make it non-spill or you can remove it to have it free-flow - since she can manage the doidy (almost) which should she be using, free-flow or learning to suck from it with the valve in place? I don't want tp take a step backwards with her since she can pretty much get the cup? Any advice?