Just gone through the same thing mate, only car between us was the Zed, baby due in 3 weeks time...
...we bought a Focus in December, we started sorting out the nursery In Jan, two months before, where the Focus came into its own with it comfortably transporting chests of drawers/baby changers and the like. Really though, no need for the sensible car until a few months beforehand.
That said, Becks loves the Zed, and she appreciates that its a passion of mine as I do keep it running 100% with regular check ups and wash it every weekend. She likes to go off do Yoga blah blah but thats her passion, it would be unfair if I said she couldnt waste money on that with a baby on the way in the same way she wont say I waste money on the Zed. Just means that we don't go to restaurants as often etc and actually makes us tidy up our finances!