A friend of mine has a baby and fits the pram in the boot! But they had to look around for a while to find one that folded up small enough - I think they ended up with one which is like a baby seat which then clips into a frame (so only the frame has to fit in the boot).
But if you've not got your heart set on an Arosa, go for the
Ibiza just to have the extra space so you don't have to play Tetris every day!