Just idle curiosity as DD is 8 mo now so I'm counting down till cows' milk...
I thought I read somewhere that the idea that you couldn't change formula was nonsense but I might have dreamt it. I don't mean using one and then changing permanently. I mean more like using formula A, running out and dashing in a panic to the all night Spar where they only sell Formula B. Using that for a couple of feeds until you get to the supermarket and stock up on formula A.
Am I talking rubbish?