Hi apple,

I believe the ambulance service - or someone connected to them hires out capsules.
They say that bubs can stay in them for up until 6 months, however most people I know have had their bubs grow to long for them after about 4 months.

For Aidyn I just used a convertible car-seat right from birth, and we haven't had any problems whatsoever.
We had to buy a compact model (Fisher Price) to suit our smaller car, as some of the larger capsules are too big to fit behind the passenger seat in the rearward facing position.