I'm thinking what you mean by a reversable is it does rear facing and forward facing seating positions, in which case it is fine, that is what I had for DD. Call the RTA hotline to find your nearest fitter and they will put it all in for you and when the time comes you can take it back and get them to turn the seat around for you.

As for the forward facing position, You can sit you bub up when they are in the correct weight range and can sit unassisted, being able to comfortably hold their own head up etc, which is generally around the 6 months mark.

They don't recommend putting bubs in the 3rd row at all, it is best having them in the 2nd row until they are at least in a booster seat (as a toddler).

I hope this has helped, it's always easier (when the time comes) to take your car seat to the RTA fitter and they do go through a lot with you to clear up any confusion you may have.