you recomend laying down blankets under the carseat?
congratulations!!!! Enjoy it! The first years are fun (they're tough too, but that a different story...).
Absolutely do put a blanket under the car seat!
I just bought my 09 GT 5 weeks ago "even though" we have a 3 1/2years and an 11month old kid. Here's what I did:
1. I bought seat protectors like these:
Amazon.com: Kiddopotamus Duomat 2 in 1 Car Seat Protector Mat: Baby
I bought two for the infant car seat, folded them in half, put one on the seat itself, the other (also folded) on the seat rest. The will provide enough "foamy" padding for your seats and it will allow you to strap down the car seat really tightly so it won't move around.
2. I bought a bathing towel, big enough to cover the entire back seat (about 4x5 feet) at Bed Bath and Beyond (for like $15), then I cut holes into the towel where the Latch connectors need to go through. I put this towel on top of the seat protectors. My car has black leather interior, so I bought a black towel. It's hardly noticeable.
3. I bought the following Seat Back Protectors:
Amazon.com: Auto Seat Back Protector 2 Pack: Baby
These go on the back side of the driver's and passenger's seat.
Both the towel and the seat back protectors will prevent stains by spills on the seats. And believe me, those spills will happen. The kids drop milk bottles all the time, and milk leaves nasty stains on leather and fabric.
4. Finally, I bought these heavy duty rubber floor mats for the rear floor:
Amazon.com: Rubber Queen 70501 4 Piece Vinyl Floor Mats - Black: Automotive
You can cut them to size to fit the Stang. For me, they have prevented many stains on the carpet.
I know all of the above sounds like a real pain in the *ss, (and it probably is), but this is the kind of compromise I was willing to do so I could buy the Stang (without getting the divorce right now...).
Hope this helps!