It totally depends on the kids and the carseats about what fits!
Because I drive a beetle we had already bought the slimmest seats available, and my pram only fits in the boot if you take a wheel off... But I've done it for 6 years now so I'll likely make myself cope...
My bigger stress is fitting bub into the house and like you finding money in short amount of time... Pregnancy management fee and school fees etc etc coming soon.
We will likely take Miss 6 out of private school at end of year to save some $$$